Questions tagged [road-vehicles]

Use this tag for question about cars, trucks and other road transport.

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9
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1answer
3k views

Can riding a motorcycle without earplugs cause hearing damage?

I've heard claims before that when riding a motorcycle, wind noise (especially on the highway) is loud enough that it will cause eventual hearing loss. Personally, I ride a motorcycle, and I usually ...
9
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1answer
719 views

Can an on-the-fly water electrolyzer linked to the air intake improve fuel efficiency of a gasoline engine?

This article initially seems to investigate so-called water powered cars. The final few paragraphs of the article however branches off into discussion about a system where (as I understand it): A car'...
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2answers
3k views

Does left-foot braking result in faster driving?

Does braking using your left foot (like Formula 1 drivers would) make you a better/faster driver? And why? Is it only better/faster if you don't have a clutch? So then it would not be impressive at ...
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0answers
409 views

Did a Blackberry service outage reduce traffic accident rates in Dubai and Abu Dhabi?

A report from The National has been widely cited on the Internet recently: A dramatic fall in traffic accidents this week has been directly linked to the three-day disruption in BlackBerry services. ...
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393 views

Are electric cars better for the environment than internal-combustion cars? [duplicate]

Possible Duplicate: Does a car with a hybrid engine and Lithium batteries pollute more than a car with conventional technology? We hear a lot about electric cars being the future. But we also ...
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3answers
41k views

Does a turbo-charged engine require a “cooling down” period?

Some people are saying that after having driven a car with a turbo-charged engine, you need to let the engine run for several seconds (or even minutes) before switching off the engine. But nobody is ...
8
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2answers
956 views

Is the self-driving car technology of 2017 less lethal than human drivers?

Youtube channel veritasium, on a video called "The real moral dilemma of self-driving cars" (ref) claims that if all cars in 2017 were self-driving, hundreds of lives could be saved. So he is claming ...
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2answers
3k views

Seat belts in cars save the lives of occupants in cars, but do they lead to lower deaths for all road users?

Reading and contributing to the skeptics debate about the effects of cycle helmets reminded me of the much more significant debate on seat belts in cars. Most countries seem to have accepted that ...
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1answer
1k views

Is it illegal to stop a car for a pedestrian crossing in China?

Today while preparing for one of my classes, this time on law, I found the snippet on a great many websites saying that in China: Drivers of power-driven vehicles are forbidden to stop at ...
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3answers
301 views

How effective are reflectors at preventing pedestrian deaths?

http://www.safetyreflectors.com/education.html has some claims about reflectors: Studies have proven that the risk of being hit by a motorist in the dark is eight times lower when wearing a safety ...
8
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1answer
865 views

Did DUI fatalities increase or decrease due to legalization of marijuana?

I've seen conflicting articles claiming that DUI fatalities either increased or decreased after states legalized marijuana. Here are two samples, though there are many articles out there; "Since ...
8
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1answer
2k views

Did the Paul Walker crash happen at ~45 mph speed?

Heavy.com report that the car crash that killed actor Paul Walker was at about 40-45 miles per hour (64-72 km/h). They cite an NBCNews tweet: Update: Paul Walker was not drag racing at time of ...
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1answer
322 views

Would lowering the speed limit in NYC by 5mph lower the number of pedestrian deaths by a factor of 2?

According to the Mayor of New York City, De Blasio: (my emphasis) Excessive speed contributes to 25 percent of roadway fatalities on New York City Streets and is the leading cause of motor vehicle ...
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2k views

Is filling multiple vehicles in one transaction at a gas station a safety hazard?

According to this gas station, pumping gasoline into more than one vehicle is a serious safety hazard: The gas station making this claim charges different customers different prices per gallon ...
7
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2answers
16k views

Is a repaired car tire as good as a new one?

I recently had one of my car tires punctured by a screw. It lost pressure only very slowly, it probably took a couple of days before I noticed the tire was below pressure. The guys from the tire ...
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2answers
4k views

Does the Lexus LFA need digital gauges because analogue ones are too slow?

I first heard this claim a few years ago on the Top Gear program from the BBC. Since then I keep hearing it whenever I hear the Lexus LFA discussed. From this February 2012 article: This ...
7
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1answer
2k views

Does putting a reflective screen inside your car against the windshield have a meaningful impact on internal temperature?

In southern climes one can see many such reflective screens on cars in parking lots. Not all drivers use them, but many do. Is there a meaningful impact on the internal temperature of your car? Does ...
7
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1answer
753 views

Can all new gasoline vehicles run on E85 ethanol-based fuel?

From the the documentary Pump at 1:07: NARRATOR: But what if we don't need a flex fuel car or even a kit? What if the car you drive today already contained the technology that could enable it to ...
7
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1answer
3k views

Are manual transmission cars stolen less?

There is a decent amount of anecdotal evidence about manual transmissions being a good anti-theft device - but are there any statistics? Here's a statistic-less article from MSN.com It's folk wisdom: ...
7
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1answer
488 views

Was there a time when the RSL banned Japanese cars from their carparks?

From Prime Minister - Address at CEDA's 2014 State of the Nation Conference, Parliament House, Canberra Prime Minister Menzies for instance opened up trade with Japan at a time when Japanese cars ...
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2answers
6k views

Do you need to break in new engine on a car/bike for first 1,000 km by driving slowly and otherwise following manual's advice?

Normally car manuals say to let the car break in gently, not accelerating or breaking fast for first 1,000 km or driving below 80km/h. Is that really necessary in today's world? Is there any proof ...
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1answer
2k views

What is the real history behind of the Ford GAA engine?

I have been searching for quite some time trying to find out if what I have heard is true with the history of how the Ford GAA engine came to be. (Note: this site has some errors, such as its ...
7
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1answer
605 views

Do directional tread patterns on tires reduce hydroplaning?

Treaded car tires are said to be better at avoiding hydroplaning than smooth tires (slicks) in the rain. In particular, directional treads are thought to be the best. The following is an example of ...
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546 views

Do “big-battery” electric vehicles release more CO2 than diesel equivalents over their lifetime?

Autocar report that Mazda have made a surprising claim about electric vehicles with larger batteries (i.e. 95kWh): Mazda says it will never build a ‘big-battery’ electric car, because it believes ...
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500 views

Do defensive driving courses reduce car accidents in teenage drivers?

A fairly common claim is that young learner drivers should take defensive driving courses so that they know what to do if they lose control of their car. This comes with the implications it will ...
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0answers
551 views

Can aspirin revive a flat car battery?

I just read this article on The Reader's Digest which writes to say If you get behind the wheel only to discover that your car’s battery has given up the ghost — and there’s no one around to ...
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4answers
6k views

Are BMW Owners the worst drivers?

BMW drivers are widely thought to be poor drivers. For example, in a poll for Auto Trader: Around 21,000 motorists were quizzed, and 45 per cent said BMW drivers were the worst on the road. Is ...
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1answer
11k views

Eggs + Water = Total windscreen blindness!

I was just sent this hoax email, but wanted to check one of the claims in it: IF YOU ARE DRIVING AT NIGHT AND EGGS ARE THROWN AT YOUR WINDSCREEN, DO NOT STOP TO CHECK THE CAR, DO NOT OPERATE ...
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2answers
2k views

Are seat straps in child restraints less effective when they are twisted?

My wife and I have seen many parents in a rush buckle their kids in a car seat despite one of the straps being twisted (I've even done it myself a few times- don't tell my wife- because I had a hard ...
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2answers
657 views

Does E15 fuel damage cars newer than 2001?

Blogger David Woodsmall warns that E15 fuel (that is a blend of 15% ethanol and 85% gasoline) might be bad for some cars that are not certified to accept it: One of the chief complaints by E15 ...
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2answers
2k views

Does the time of day affect fuel economy?

One tip that I heard as a young driver was something along the following: Try to refuel in the early morning or in the evening as the denser gas will get you better fuel economy. Since then I ...
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1answer
5k views

Does the type of oil you use in your car make a difference?

I have a car that has over 140k on it. Are there any valid reasons to use high milage oil instead of conventional oil? Or is it just a marketing gimmick? Similarly what's the difference between ...
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1answer
509 views

Are Silvester (New Year's Eve) fireworks as pollutive as cars in one year?

In my local newspaper, the Salzburger Nachrichten, there was the following article to be found on 31st of December, 2016: Guten Rutsch - krach, bumm! Hell wird es wieder sein am Nachthimmel und schön ...
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1answer
447 views

Does cryogenic treatment of automobile rotors increase performance?

In the performance brakes world, there is a small amount of debate about the benefits of cryogenically treating rotors, with most people believing that cryo treating rotors greatly improves their ...
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0answers
515 views

Do strobes on top of school buses improve safety?

Background In many states of the USA, school buses are fitted with a "roof-mounted strobe". In some states, they are required by law: Mike Simmons, state director in Arkansas, says that the ...
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0answers
376 views

Was a self-driving car pulled over by police for the first time last month (November 2015)?

I read in this Bloomberg article Google cars have been in 17 minor crashes in 2 million miles (3.2 million kilometers) of testing. [...] Ten days later, a Mountain View motorcycle cop noticed traffic ...
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0answers
6k views

Does a car tire require 26 Liters / 7 US Gallons of crude oil to manufacture?

I've recently seen the movie Collapse. They make many claims about oil and an hypothetical global collapse when it runs low. In this movie, Michael Ruppert says that a simple car tire needs 7 US ...
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0answers
690 views

“We have the right tires for your driving style.” [closed]

I saw an ad for a tire company today stating that they have the right tires for your driving style. When I buy tires I look for silent tires with long lifespan, good grip and most importantly a decent ...
6
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1answer
686 views

Is using a phone while driving more dangerous than driving while drunk?

There have been numerous studies that show how using a phone while driving is more distracting than other non-driving tasks and even worse than driving while intoxicated. Here was a study done in the ...
5
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1answer
273 views

Did Volkswagen, Chrysler and/or GM cut diesel tailpipe emissions by ~99% over a decade?

This article, dated Jan 5, 2014, makes a rather vague claim that Companies such as Volkswagen AG, Chrysler Group and General Motors have invested billions to make that happen, outfitting vehicles ...
5
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1answer
634 views

Can using heated car seats reduce fertility?

A family member warned me not to use heated car seats, since they cause infertility and cancer in both men and women. I searched the internet for a source for his claims and I found this Telegraph ...
5
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1answer
19k views

Do modern turbo-diesel car engines fail significantly more often than gasoline ones?

I've seen quite a few articles written on subject, mainly based on anecdotal evidence and with generally alarmistic tone. Allegedly modern turbo-diesel engines used in popular cars are much less ...
5
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1answer
546 views

Are Maryland's vehicle emissions tests a net benefit for the environment?

I am skeptical that vehicle emissions programs like Maryland's VEIP are a net win overall. You generate emissions by driving there in the first place, and idling while you wait your turn. Almost all ...
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0answers
585 views

Does an old car with engine turned off pollute more than a new car going 60 mph? [closed]

On the show Real Time with Bill Maher (Jan 9, 2015), Jay Leno (a guy that seems knowledgeable about cars) made this very interesting statement 37 minutes in: A 1977 Ford Galaxy, one of those big ...
4
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2answers
440 views

Feasibility of electric car production given current production levels of various elements and compounds

This infographic (source) shows the elements required for production of 20 million Tesla cars per year, and compares that with current production rates of those elements. Looks like this was in ...
4
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1answer
373 views

Do cars produce more emissions idling than when in motion? [closed]

The author of this article claims that Cars produce more emissions when idling than when in motion. This seems like a patently false statement. How could cars produce more emissions when idling ...
4
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1answer
506 views

Are “black-box” data recorders to be installed in all new US cars?

Occupy Corporatism reports: With complete disregard for driver privacy, the Obama administration gave their consent to the National Highway Traffic Safety Administration (NHTSA) to mandate black box ...
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3answers
2k views

Can remote starters make a car move unattended?

On an episode of a popular television show, a man is showing off his new truck. While bragging about the interior, he accidentally hits the stick with his arm, and puts it in gear. Then, when he ...
4
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1answer
758 views

Did hundreds of thousands of people die due to lack of seat belts in the period before they were made mandatory?

In a recent interview, Tesla founder Elon Musk gives a historical reference as example of slow government reaction to public harm: At 8m15s: Take something like seatbelts. It was known for, I ...
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3answers
1k views

Is the Katy Freeway the widest in the world?

According to this source and several others (like Sylvester Turner, the mayor of Houston), a section of I-10 in West Houston called the Katy Freeway is the widest highway on Earth. Its widest point is ...