Write the name of the person who helps to maintain the variance at the ends of a driver
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Road speed limits are used in most countries to set the legal maximum or minimum speed at which road vehicles may travel on a given stretch of road.[2] Speed limits are generally indicated on a traffic sign reflecting the maximum or minimum permitted expressed as kilometres per hour (km/h) and/or miles per hour (mph). Speed limits are commonly set by the legislative bodies of national or provincial governments and enforced by national or regional police and judicial authorities. Speed limits may also be variable, or in some places unlimited, such as on most of the Autobahn in Germany.[3]
The first numeric speed limit for automobiles was the 10 mph (16 km/h) limit introduced in the United Kingdom in 1861.[4]
The highest posted speed limit in the world is 160 km/h (99 mph), which applies to two motorways in the UAE.[5] Although speed limit and safety distance are poorly enforced in this country, specifically on the Abu Dhabi to Dubai motorway (which results in dangerous traffic according to a French government travel advisory).[6] Additionally, "drivers often drive at high speeds [and] unsafe driving practices are common, especially on inter-city highways. On highways, unmarked speed bumps and drifting sand create additional hazards" according to an American government travel advisory.[7]
There are several reasons to regulate speed on roads. It is often done in an attempt to improve road traffic safety and reduce the number of casualties from traffic collisions. The World Health Organization (WHO) identified speed control as one of a number of steps that can be taken to reduce road casualties.[n 1] This followed a report in which the WHO estimated that some 1.2 million people were killed and 50 million injured on the roads around the world in 2004.[n 2]
Speed limits may also be set to reduce the environmental impact of road traffic (vehicle noise, vibration, emissions) and as a political response to local community concerns for the safety of pedestrians. For example, a draft proposal from Germany's National Platform on the Future of Mobility task force recommended a blanket 130 km/h (81 mph) speed limit across the Autobahn to curb fuel consumption and carbon emissions.[8] Some cities have reduced limits to as little as 30 km/h (19 mph) for both safety and efficiency reasons.[9] However, some research indicates that changes in the speed limit may not always alter average vehicle speed.[10]
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