WASHINGTON (AP) — Six states that allow marijuana use legal tests to determine driving while impaired by the drug that have no scientific basis, according to a study by the nation's largest automobile club that calls for…

Traffic accidents kill 1.25 million people per year, and it’s well-known that those deaths are disproportionately in low- and middle-income countries. Over at CityMetric, writer James O’Malley has added an interesting wrinkle, by showing a correlation between the number of traffic fatalities in a country and the corruptness of its government.

A traffic jam, by definition, is caused by all of us. The root cause may be an accident, or construction, or the crush of mid-sized SUVs leaving a Billy Joel concert, but if you’re part of the traffic flow, you’re part of the problem. But for some kinds of traffic jams — those that appear for no obvious reason — there’s a not-obvious solution. A single driver, armed with a rudimentary knowledge of fluid dynamics, can dissipate or prevent a miles-long jam. With the same...

A convoy of self-driving trucks recently drove across Europe and arrived at the Port of Rotterdam. No technology will automate away more jobs — or drive more economic efficiency — than the driverless truck. Shipping a full truckload from L.A. to New York costs around $4,500 today, with labor representing 75 percent of that cost. But those labor savings aren’t the only gains to be had from the adoption of driverless trucks.

Saudi Arabia isn’t ready to end the world’s only ban on women driving.

There haven't been so few 16-year-olds on the roads since the 1960s.

Using a mobile phone while driving is actually viewed as unacceptable by many people when they’re asked about it; yet it’s still a behavior that is readily undertaken and there’s currently little social stigma attached to it. Cultural change will only occur when people start publicly stating that they have an issue with it.

The Obama administration has proposed spending $4 billion to accelerate autonomous-car technology during the next decade. For $20,440, you can get a Honda capable of driving itself pretty well on a highway today. Honda Motor Co. is releasing automated safety features on its entry-level vehicle Civic LX sedan, a step that takes some of the most sophisticated technology on the market available and makes it accessible...

A trial began in August 2014 to see if lines made drivers unnecessarily confident.

Sensational news. The government is starting to remove white lines from the middle of roads in parts of the UK. It is doing so to reduce accidents and save lives. The idea is apparently revolutionary. Research has shown that removing white lines induces uncertainty and thus cuts vehicle speeds by 13%. This has been the case on London’s A22, A23 and A100. Pilot schemes are also in place in Wiltshire, Derby, and round the Queen’s house at Sandringham (don’t ask).

Samsung showed off a concept in 2015 of a truck mounted with screens and cameras so drivers on the road behind are able to see if it’s safe to overtake – but it didn’t say if it would actually build them. Now it’s getting serious about the initiative, announcing that it built a prototype version in partnership with Helvetica SA and Volvo Trucks Argentina. The Samsung Safety Truck features two front-facing cameras and four high-definition OH46D video screens on the back.

It really must be heaven to be a cyclist in Denmark. You get lovely, dedicated infrastructure, like this new bridge. You get cities that run analyses showing how bikes are good for people, and cars aren't. And now, if you live in Aarhus, you can get a special tag to help beat the traffic lights. Aarhus, Denmark's second largest city, is currently running a trial where cyclists are given RFID tags that they attach to their wheels.

Jan. 21 -- Starting in 1908, Henry Ford sold his novel Model T cars as the first to be really accessible to the masses. What's more, he marketed them as easy to handle for casual drivers and (gasp!) women since they started with a button rather than a crank. Thing is, those old Model Ts were still pretty complicated to drive. Bloomberg Pursuits' Hannah Elliott took a 1914 Model T for a spin but first she needed a driving lesson.

It impedes traffic, is banned in all 50 states, and likely makes everyone less safe.

Self-driving cars could disrupt the airline and hotel industries within 20 years as people sleep in their vehicles on the road, according to a senior strategist at Audi. Short-haul travel will be transformed and the hassle of getting to and from airports eliminated, said Sven Schuwirth, vice president of brand strategy and digital business at the German car brand. Business travellers will be able to avoid taking domestic flights to meetings and will sleep and work in their cars en route...

The UK government introduced an experimental speed limit of 70mph on motorways in England. The trial was introduced due to the high number of accidents while drivers were free to go as fast as they liked after the first highway – the M1 – was opened in 1959. The two-year experiment by the Department of Transport was deeply unpopular and led to protest campaigns by motoring groups such as the RAC and AA. But by 1967 – when Transport Secretary Barbara Castle made her decision to make the...

If you think about it, traffic signs should be invisible. Not see-through invisible, but intuitively invisible; if they work like they’re supposed to, you won’t even realize you’re using them. That was the challenge put to Lock Kinneir and Margaret Calvert in 1958, when the British government hired the London designers to devise a new signage system for the country’s roads.

If we were able to raise the gas tax by 40 cents and repair our highways and roads, we would create no new net burden on consumers. And as is fair, those who drive the most would both pay the most and benefit the most from reduced repair costs.

The idea of fitting a car with a video camera only struck many motorists as a good idea in February 2013. That was when a meteor streaked over Chelyabinsk in Russia. Small video cameras that film the road ahead are being used by motorists to help keep them out of trouble and avoid bogus insurance claims.