Drive under the influence ( DUI ), distracted driving / driving while intoxicated ( DWI ), operate in motion sickness ( OWI ) or drink-driving (UK) is currently a crime or a driver's offense or operate a temporary motor vehicle destroyed by alcohol or other drugs (including drugs and prescribed by doctors), to a level that keeps the driver unable to operate the vehicle safely.
Traffic accidents are mostly caused by driving under the influence; for people in Europe between the ages of 15 and 29, DUI is one of the leading causes of death. According to the National Highway Traffic Safety Administration, alcohol-related accidents cause about $ 37 billion in damages each year. DUI and alcohol related damages generate about $ 45 billion in damages each year. Among attorney fees, fines, court fees, interlock locking devices, and DMV fees, DUI fees can cost thousands to tens of thousands of dollars.
With alcohol consumption, the drunk driver's hangover rate is usually determined by measurement of blood alcohol level or BAC; but this can also be expressed as a measurement of a breath test, often referred to as BrAC. Measurements of BAC or Brac that exceed a specific threshold, such as 0.08%, define a criminal offense without the need to prove a nuisance. In some jurisdictions, there are categories of violations that are aggravated at higher BAC levels, such as 0.12%, 0.15% or 0.25%. In many jurisdictions, police officers can conduct field tests on suspects to look for signs of poisoning. The US state of Colorado has the maximum blood content of THC for drivers who consume marijuana.
In most countries, calm checkpoints (roadblocks of police cars where drivers are checked), driver's licenses, fines, and imprisonment for DUI offenders are used as a deterrent. Anyone convicted of driving under the influence of alcohol or other drugs can be severely fined or sentenced to imprisonment. In some jurisdictions, impaired drivers who injure or kill others while driving may face more severe penalties. In addition, many countries have prevention campaigns that use advertising to make people aware of the dangers of driving when disturbed and the potential for fines and criminal charges, reduce driving impulses, and encourage drivers to use taxis or public transport to the house after using alcohol or drugs. In some jurisdictions, blades serving disturbed drivers may face civil liability. In some countries, nonprofit advocacy organizations, a notable example is Mothers Against Drunk Driving (MADD) running their own publicity campaign against drunk driving.
Video Driving under the influence
Terminology
The name of the violation varies from jurisdiction to jurisdiction and from legal term to colloquial. In the United States, special criminal offenses are usually called driving under the influence, but in some states "drunk driving" (DWI), "interrupted while operating" (OWI) or "operating in distress", "operating vehicles under the influence influence "(OVI), etc. The law also applies to boating or pilot aircraft. Vehicles may include farm machinery and horse-drawn carriages. Other terms commonly used to describe these violations include drinking and driving, drunk driving, drunk driving, driving disturbances, operating under influence, or "exceeding specified limits".
In the United Kingdom, offenses are often known as "drunk in charge of motor vehicles" or "drunk in charge" because of the words of the Licensing Act of 1872. In relation to motor vehicles, the 1988 Road Traffic Act creates a narrow a violation of driving (or liability) of the vehicle when it has breath, blood or urine alcohol levels above the prescribed limit (colloquially called "overstep"); and a wider breach of "improper driving when drinking or drugs," which may apply even at levels below the limit. Separate violations in the 1988 Act apply to bicycles. Although the 1872 law was largely superseded, the offense for "drunkenness in power... of every train, horse, cattle, or steam engine" is still valid; "trains" are sometimes interpreted as including mobility scooters.
Maps Driving under the influence
Definitions
Criminal violations may not involve actual vehicle riders, but may extensively cover physically controlling cars while intoxicated even if the person accused of not driving. For example, someone found in a car driver's seat while drunk and holding a lock, even while parked, can be charged with DUI, as he is in control of the vehicle. In interpreting the terms DUI, DWI, OWI and OVI, some countries therefore make it illegal to drive motorists while under the influence or driving while drunk while others indicate that it is illegal to operate motor vehicles . There is a separation of authority across the country on this issue. Some countries allow the enactment of DUI/DWI and OWI/OVI laws based on vehicle "operation and control", while others require actual "steering". "The difference between these two terms is material, since it is commonly held that the word 'drive,' as used in this kind of statute, usually shows the movement of vehicles in several directions, whereas the word 'operate' has a broader meaning, vehicles, but also actions involving vehicle engines that, on their own or in sequence, will drive the motive force of the vehicle. "( Country v. Graves (1977) SC 296 [237 SE2d 584, 586-588, 586. fn. 8].
The Dictionary of Merriam Webster defines DUI as "the crime of driving a vehicle while intoxicated; also : a person who is arrested for driving a drunk driving or driving crime while being affected by alcohol or drugs People who are arrested or punished for driving under the influence or arrest or conviction to drive under the influence In some countries (including Australia and many jurisdictions throughout the United States), a person may be charged with a crime for riding a bicycle, skateboard, or horse while drunk or under the influence of alcohol.
Alcohol
Blood alcohol content
Drinking enough alcohol to cause 0.03-0.12% blood alcohol concentration (BAC) usually results in a red flushing in the face and impaired assessment and good muscle coordination. BAC 0.09% to 0.25% caused lethargy, sedation, balance problems, and blurred vision. BAC from 0.18% to 0.30% causes major confusion, speech impairment (eg, slurred speech), shocking, dizziness and vomiting. BAC from 0.25% to 0.40% causing fainting, unconsciousness, anterograde amnesia, vomiting and respiratory depression (potentially life-threatening). BAC from 0.35% to 0.80% leads to coma (unconscious), life-threatening respiratory depression and potentially fatal alcoholic toxicity.
Breathalyzer is a tool for estimating BAC from breath samples. It was developed by the inventor Robert Frank Borkenstein and registered as a trademark in 1954, but many people use this term to refer to any generic device to estimate the alcohol content in the blood. With the advent of scientific tests for the BAC, law enforcement regimes shift away from the test of tranquility (for example, asking a suspect to stand on one foot) to have more than the prescribed amount of alcohol in the blood while driving. However, this does not preclude the existence and concurrent use of older subjective tests in which police officers measure the suspect's poisoning by having them perform certain activities or by checking their eyes and responses. BAC is most conveniently measured as a simple percentage of alcohol in the blood by weight. Research shows an exponential increase of relative risk for accidents with linear increase in BAC as shown in the illustration. BAC does not depend on any measurement unit. In Europe it is usually expressed as milligrams of alcohol per 100 milliliters of blood. However, 100 milliliters of blood weighs the same as 100 milliliters of water, which weighs exactly 100 grams. Thus, for all practical purposes, this is the same as the BAC without a simple dimension measured as a percent. The measurement per mille ( promille ), which is equal to ten times the percentage value, is used in Denmark, Germany, Finland, Norway, and Sweden.
Depending on the jurisdiction, the BAC can be measured by the police using three methods - blood, breath, or urine. For law enforcement purposes, breathing is the preferred method, because the results are available almost instantaneously. Validity of equipment/testing methods and mathematical relationships for the measurement of breath and blood alcohol have been criticized. Improper testing and equipment calibration are often used to maintain DUI or DWI. There was a case in Canada where the officers came to an unconscious suspect after the accident and the officer took a blood sample.
Driving while drinking alcohol can be illegal in jurisdictions. In some cases it is illegal for open containers of alcoholic beverages to be in the passenger compartment of a motor vehicle or in certain areas of the compartment. There are cases of drivers being punished for DUI when they are not observed driving after being proven in court they have been driving under the influence.
In case of an accident, car insurance can be declared automatically invalid for the drunk driver, ie the drunk driver is entirely responsible for the damage. In the American system, a quote for driving under the influence also leads to a major increase in auto insurance premiums.
The German model serves to reduce the number of accidents by identifying inappropriate drivers and removing them from until their fitness for driving has been set again. The Medical Psychological Assessment (MPA) works for the prognosis of fitness for future driving, has an interdisciplinary basic approach and offers individual rehabilitation opportunities to the offender.
George Smith, the taxi driver of the London Taxi, finally became the first person to be punished for drunken driving, on September 10, 1897. He was fined 25 shillings, which is equivalent to Ã, à £ 130 by 2016.
Risk
Studies show that high BAC increases the risk of accidents while it is unclear whether BAC 0.01-0.05% slightly increases or decreases risk.
Traffic accidents are mostly caused by driving under the influence for people in Europe between the ages of 15 and 29, it is one of the leading causes of death. According to the National Highway Traffic Safety Administration, alcohol-related accidents cause about $ 37 billion in damages each year. Every 51 minutes someone dies due to an alcohol-related accident. When it comes to risk taking there is a larger male and female ratio as personality traits, antisocialities and risk taking are considered because they are all involved in the DUI. More than 7.7 million minors aged 12 to 20 years admitted drinking alcohol, and on average, for every 100,000 Americans under age, 1.2 died in drunk driving traffic accidents.
Grand Rapids Dip
One study showed that a BAC of 0.04-0.05% would slightly increase risk whereas some studies show that BAC 0.01-0.04% would slightly lower the risk, referred to as The Grand Rapids Effect , based on a seminal research study by Borkenstein, et al. (Robert Frank Borkenstein famous for creating Drunkometer in 1938, and Breathilizer in 1954.)
Some literature has linked the Grand Rapids Effect with incorrect data or confirmed (without support) that it may be caused by extra careful drivers at low BAC levels or to "experience" in drinking. Another explanation is that this effect is at least partially blocking the effects of ethanol excitotoxicity and the effects of alcohol in essential tremor and other motion disorders, but this remains speculative.
Both studies are influential by Borkenstein et al. and empirical German data in the 1990s showed that the risk of accidents was lower or the same for drivers with BAC 0.04% or less than for drivers with 0% BAC. For BAC 0.15% the risk is 25 fold. The 0.05% BAC limit in Germany (since 1998, 0.08% since 1973) and borders in many other countries is based on research by Borkenstein et al. Researchers of the University of WÃÆ'ürzburg point out that all the extra accidents caused by alcohols are due at least 0.06% BAC, 96% of them due to BAC above 0.08%, and 79% due to BAC above 0.12%. In their study based on German data in the 1990s, the effects of alcohol were higher for almost all BAC levels than in Borkenstein et al.
In Blomberg et al. studying crash statistics showed lowered risk for BAC 0.01% to 0.04% (87-92% of risk of drunk driver). When adjusted for demographic variables, already at 0.05% BAC the risk seems to be slightly higher than for the same driver at 0% although less than for the average 0% driver. After this adjustment, the lower risk on BAC 0.01-0.03% (92-94%) was not significant. When selection bias estimates are also corrected, the risk for these drivers is estimated to be 3-6% higher than that of drunk drivers, although the difference is not significant. At Grand Rapids Alsop studied the risk of accidents in BAC 0.01-0.03% only 80-96% of drunk drivers. Also in the Grand Rapids study by Alsop, 0.01-0.03% of BAC causes an 80-96% accident risk of a drunk driver's risk.
Other drugs
For drivers suspected of drug-induced driving, screen drug testing is usually performed in a scientific laboratory so that the results will be accepted as evidence in the trial. Due to the amount of non-alcoholic damaging substances, drugs are classified into different categories for detection purposes. Drivers with drug disturbances still exhibit disruption during standard standard field seizure batteries, but there are additional tests to help detect drug driving disorders.
The Drug Evaluation and Classification Program is designed to detect drug-addicted drivers and classify drug categories that exist within their systems. The DEC program breaks detection into a twelve-step process that can be used by Government-recognized DRE Experts to determine the category or category of drugs suspected by the suspect. The twelve steps are:
- The Breath Alcohol Test
- Interview with the arresting officer (who recorded the lisp speech, alcohol on the breath, etc.)
- Initial evaluation
- Eye evaluation â â¬
- Psychomotor test
- Vital signs
- Dark room check
- Muscle tone
- Injection site (for heroin injections or other drugs)
- Suspect interrogation
- The opinion of the evaluator
- Toxicology check
DREs are eligible to offer expert testimonials in court relating to drug distraction. The use of a twelve-step process is scientifically validated by various field studies.
recreational drugs
Drivers who smoke or consume cannabis products such as marijuana or marijuana can be charged and punished for driving disruption in some jurisdictions. A 2011 study at B.C. Medical Journal states that there is "... is clear evidence that marijuana, like alcohol, destroys the psychomotor's capabilities needed for safe driving." This study states that while [c] drivers with annarial disorder tend to drive more slowly and more cautiously than drunk drivers,... evidence suggests that they are also more likely to cause accidents than drivers who are drug-free and alcohol. " In Canada, police forces such as the Royal Canadian Mounted Police have "... a specially trained drug introduction and evaluation officer [DRE] officer... who can detect whether a driver is addicted to drugs, by placing a suspect through a physical examination and a coordination test. In 2014, in the Canadian province of Ontario, Bill 31, the Amendment Law on Transportation Statue Act, was introduced to the provincial legislature. Bill Bill 31 contains a "driver's license...... for those caught driving under the influence of drugs, or a combination drugs and alcohol. Ontario police officers "... use standard field tests and drug recognition evaluations to determine whether officers believe the driver is under the influence of drugs." In the province of Manitoba, a "... officer may issue a physical coordination test." At B.C., officers may further order an evaluation of drug recognition by an expert, which can be used as evidence of drug use to pursue further costs. "
In the US state of Colorado, the state government indicates that "high marijuana consumption makes you at risk of impaired driving." Colorado law states that "drivers with five nanograms of tetrahydrocannabinol (THC) active throughout their blood can be prosecuted for driving under the influence (DUI).However, regardless of THC level, law enforcement officers base their capture on observed disorders." In Colorado, if marijuana consumption damages your ability to drive, "it's illegal for you to drive, even if the substance is prescribed [by the doctor] or obtained legally."
Prescription drugs
Prescription drugs such as opioids and benzodiazepines often cause side effects such as excessive drowsiness, and, in the case of opioids, nausea. Other prescription drugs including antiepilepsy and antidepressants are now also believed to have the same effect. In the last ten years, there has been an increase in motor vehicle accidents, and it is believed that the use of prescription drugs that have been destroyed has been a major factor. Workers are expected to notify their employers when determining these drugs to minimize the risk of motor vehicle accidents while working.
If a worker driving has a medical condition that can be treated with opioids, then the person's physician should be informed that driving is part of the duties of the worker and the employer should be informed that the worker may be treated with opioids. Workers should not use damaging substances while driving or operating heavy equipment such as forklift trucks or cranes. If workers have to drive, health providers should not give them opioids. If workers have to take opioids, their employers should assign them jobs appropriate to their disturbed state and not encourage them to use safety sensitive equipment.
Test calm field
To try to determine whether a suspect is harmed, the police officer will usually conduct a field security test to determine if the officer has a possible cause to arrest someone on suspicion of driving under influence (DUI).
A police officer in the United States should have a Possible Cause for making the arrest for driving under influence. In determining possible causes for DUI arrest officers often consider the performance of suspects of the Standard Charity Test. The National Highway Traffic Safety Administration (NHTSA) developed a system to validate field security tests that led to the creation of the Standard Sobriety Test (SFST) test. The National Highway Traffic Safety Administration (NHTSA) establishes a standard battery of the three recommended roadside tests to be managed in a standard way to make this arrest decision. There are Non-Standard Field Non-Standard Exams as well; but Non-Standard Field Non-Standards Test has not received NHTSA Validation. This is the difference between "Standard" and "Non-Standard" Field Uncertainty Test. NHTSA has published many training guides related to SFST. As a result of the NHTSA study, the Walk-and-Turn test is determined to be 68% accurate in predicting whether the test subjects are at or above 0.08%, and the One-Footed Stand Test is determined to be 65% accurate in predicting whether the test subject is at or above 0.08% when tests are correctly administered to people within the study parameters.
Three tests validated by NHTSA are:
- The Horizontal Gaze Nystagmus Test, which involves following an object with the eye (like a pen or other stimulus) to determine the movement characteristics of the eye against the stimulus
- The Walk-and-Turn test (heel-to-toe in a straight line). This test is designed to measure a person's ability to follow instructions and to remember a series of steps while dividing attention between physical and mental tasks.
- One-Leg-Stand Test
Alternative tests, which have not been validated by NHTSA, include the following:
- Romberg Test, or Modification-Position-Attention Tests, (joint legs, back to back, eyes closed for thirty seconds).
- Finger-to-Nose test (head end to back, eyes closed, touching tip of nose with tip of index finger).
- The Alphabet Test (Read all or part of the alphabet).
- The Finger-Count Test (touch each finger from hand to thumb is calculated with each touch (1, 2, 3, 4, 4, 3, 2, 1)).
- The Counting Test (count down from a number that ends with a digit other than 5 or 0 and pauses at a number ending in digits other than 5 or 0. A series of numbers should be more than 15).
- Initial Alcohol Screening Test, PAS or PBT Test, (breathing into "portable or preliminary breath test", PAS Test or PBT).
In the US, the test of field calm is voluntary; However, some countries mandate commercial drivers receive the initial breath test (PBT). The refusal to take a preliminary breathing test (PBT) in Michigan subdues non-commercial riders against "civil violation" penalties, without "point" violations, but is not considered a rejection under general "implied consent" law. In some states, states may provide evidence of refusal to take field tests in court, although this is a questionable probability value in drunken driving prosecutions.
In the recent rise of legal marijuana, law enforcement has searched for breath testing methods to determine the content of THC present in individuals. Law enforcement efficiently combats driving under the influence with tools such as breathalyzers during field peace testing. Excluding edibles, THC breathalyzer has the potential to measure how 'high' a person is at the time. Legality of marijuana does not require road safety, and accurate methods have become necessary to determine rider trouble. THC breathalyzer can revolutionize roadside serenity testing for suspected driver disturbances.
Other charges
In the US state of Colorado, disturbed drivers may potentially be accused of harming children if they are arrested for DUI with a small child in a vehicle.
Legal by country
Drug-related legislation varies between countries or subnational regions (eg, state or province) and various alcoholic content in the blood is required before billing or confidence can be made.
Certain criminal violations may be referred to, depending on the jurisdiction, "driving under the influence" [alcohol or other drug] (DUI), "driving under the influence of alcohol" (DUII), "driving while disturbed" (DWI), " under the influence of alcohol or other drugs "(OVI)," operating under the influence "(OUI)," operating while intoxicated "(OWI)," operating motor vehicle while drunk "(OMVI)," driving under the combined influence of alcohol or other drugs "," driving under the influence per se "or" drunk in charge "[of the vehicle]. Many of these laws also apply to motorcycles, boats, pilots, use of agricultural car equipment such as tractors and merging, horseback riding or horse-drawn vehicles, or cycling, perhaps with different BAC levels of driving. In some jurisdictions there is a separate fee depending on the vehicle used, such as BWI (drunken biking), which can carry a lighter penalty.
Some jurisdictions have multiple BAC levels for different categories of drivers; for example, the state of California has a general BAC limit of 0.08%, a 0.04% lower limit for commercial carriers, and a 0.01% limit for drivers younger than 21 years old or on probation for prior DUI violations.
Some jurisdictions have legal guidelines that require mandatory minimum penalties.
DUI confidence can result in multi-year prison sentences and other penalties ranging from fines and other financial penalties to withhold license plates of vehicles and vehicles. In many jurisdictions, a judge may also order the installation of a ignition device. Some jurisdictions require that drivers convicted for DUI offenses use special number plates that are easily distinguishable from plates. These plates are known in popular languages ââas "party plates" or "whiskey plates". Argentina
In Argentina, it is a criminal offense to drive if a person's alcohol level is 0.3% or greater in local/municipal jurisdiction, stopped by city police and 0.4% if driving on a route or highway and stopped by State Highway Patrol, Federal Police Argentina, or Argentina Gendarmerie. On the highways and Cordoba State routes, the policeman without any tolerance is imposed by Cordoba State Highway Patrol and is a violation for driving with an alcohol level of more than 0.00%.
Australia
In Australia it is a criminal offense to drive under the influence of alcohol if a person's alcohol level is 0.05% or greater. Australian police use random breathing test stations, and every police vehicle can pull over to the vehicle at any time to perform a random breath test. People found to have excessive alcohol were taken to a police station or random breathing station for further analysis. Those who are more than 0.08% will receive automatic disqualification from their licenses and should appear in court.
Canada
The Canadian Federal Government has adopted the truth in penal laws that enforce strict guidelines on punishment, different from previous practices where prison time is reduced or suspended after the sentence has been issued.
In Canada, the refusal to detonate the blood alcohol testers provided by police officers carries the same punishment as those found guilty of drunk driving.
South Korea
In the Republic of Korea, it is a crime to drive if a person's alcohol level is 0.05% or greater. Police often operate calm checkpoints without prior notice, and constitute a criminal offense to refuse unintentional tests. Driving under the influence of alcohol results in suspension or disqualification of the driver's license.
United Kingdom
In English law, it is a criminal offense to become a drunk in charge of a motor vehicle. Definitions depend on things like being inside or near a vehicle, and have access to the means to start a vehicle engine and drive it (ie a vehicle lock).
The drug driving laws of England have been amended by 2015. These changes include a new roadside testing kit, which can detect the presence of cocaine and marijuana in the suspect's saliva; zero tolerance limit for a number of illegal drugs, Limits are also set for certain prescription drugs. However, the law does not end the use of field disturbance tests, but makes it more relevant to determine the disruption of motorists who are not currently covered by the new law, or can not be identified by the limited use of the device, which is currently only allowed for marijuana and cocaine.
United States
Under the laws of the United States, it is unlawful to drive a motor vehicle when the ability to do so is materially impaired by the consumption of alcohol or drugs, including prescription drugs. For impaired driving costs involving alcohol consumption, the level of alcohol in the blood in which the disorder is assumed is 0.08, although it is possible to be found guilty of driving with low blood alcohol levels.
For example, the state of California has two drunk driving laws with almost identical criminal penalties:
- V.C. Seconds. 23152 (a) - it is a violation to drive under the influence of alcohol or drugs.
- V.C. Seconds. 23152 (b) - it is a violation to drive with 0.08% or more of alcohol in a person's blood.
Under the first law, you may be found guilty of driving a car based on your inability to operate a motor vehicle safely, no matter what the level of alcohol in your blood. Under the second law, it per se is unlawful for driving with a blood alcohol level of 0.08 or greater.
For commercial drivers, BAC from 0.04 can result in DUI or DWI costs. In most states, individuals under 21 are subject to zero tolerance limits and even small amounts of alcohol can lead to DUI capture.
In some cases, it may be possible to fill with DUI in parked cars if the drunk individual is behind the wheel. In some jurisdictions, occupants of the vehicle may be subject to driving disorders even though sleeping in the back seat is based on evidence of risk that residents will drive while drunk. Some countries allow to indict DUI's efforts if officers can conclude that the defendant intends to drive a vehicle while it is disrupted.
Repeatedly distracted driving or impaired driving incidents that result in bodily injury to others may trigger more significant penalties, and potentially trigger criminal charges.
Many countries in the US have adopted the truth in penal laws that enforce strict guidelines on punishment, different from previous practices where prison time is reduced or suspended after the sentence has been issued.
Prevalence
In the United States, local law enforcement agencies made 1,467,300 arrests nationwide for driving under the influence of alcohol in 1996, compared to 1.9 million such arrests during the peak year in 1983. In 1997 approximately 513,200 defendants were imprisoned or imprisoned. from 593,000 in 1990 and up from 270,100 in 1986. In the United States, DUI and alcohol-related damages generate about $ 45 billion in damage annually. In some US and German studies, a BAC rate of 0.01-0.03% estimates accident risk is lower than 0% BAC, possibly due to extreme caution, whereas BAC 0.08% or higher appears to be responsible for almost all accidents extras caused by alcohol. For BAC 0.15% the risk is 25 fold.
Implied approval
All US states recognize "implied consent", which, according to a motorist, is deemed to have been approved for toxicity testing as a condition of motor vehicles operating on public roads. The implied consent law may result in punishment for those who refuse to cooperate with blood alcohol tests after arrest for allegedly having a driving disorder, including civic consequences such as driver suspension. The State of Kansas discovers an unconstitutional state law that makes it an additional crime to refuse such a test when no court warrant for testing exists.
Job policy
Many companies or occupations have their own BAC rules and limits; for example, the Federal Rail Administration of the United States has a 0.04% limit for the train crew. Certain big companies have their own rules; for example, the Union Pacific Railroad has a BAC limit of 0.02% each, if violated during random testing or trials - for example, after a traffic accident - may result in termination of employment without the possibility of future reemployment.
See also
- Alcoholism
- Breathalyzer
- DR10, UK police code
- Drive with drug interruption
- Hangover drivers
- Drunk walking
- California DUI
- DWI court
- Fetal alcohol spectrum disorder
- Mothers Against Drunk Driving (MADD)
- National Motorists Association
- Use of responsible drugs
Footnote
Further reading
- Barron H. Lerner (2011). One for Road: Drunk Driver Since 1900 . Baltimore, MD: Johns Hopkins University Press.
External links
- Impaired driving on MedlinePlus
Source of the article : Wikipedia