Questions tagged [road-vehicles]

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

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56
votes
3answers
9k views

Is it necessary to change motor oil every 5,000km/3,000 miles?

I've always heard that you should change your oil every 3,000 miles (5,000 km). That little sticker you get on your windshield after an oil change agrees. Growing up, my parents told me the same thing....
41
votes
4answers
5k views

Is driving the speed limit on a highway safer?

I'd have thought this would have been asked already but I didn't see it. Is driving the speed limit safer on a highway? By "highway" I mean high-traffic areas, such as 4-lane divided thoroughfares. ...
18
votes
1answer
1k views

Does Ferrari cheat at track tests?

The article How Ferrari spins by Chris "Monkey" Harris contains claims that Ferrari has dishonest practices with the press. How bad has it been? I honestly don't know where to start. Perhaps the ...
28
votes
3answers
1k views

Do cars pass with less space for bicyclists who wear helmets?

This question is an off-shoot of from the discussion about helmet safety. There is an assertion that when a car passes a bicycle, it allows less space to those who wear a helmet than those without. ...
9
votes
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 ...
30
votes
1answer
4k views

Do car alarms provide a significant reduction in automobile theft?

Noise That movie got me thinking, because it makes a number of claims about car alarms that jive with my personal feelings about them. They're noisy, obnoxious, tend to go off at night, and are ...
24
votes
2answers
14k views

Are passengers inside cars protected from lightning because of the tires?

It's a common statement that passengers of a car are protected from lightening while inside because the car has rubber tires (which are insulators). An alternative theory often put forward is that ...
14
votes
1answer
1k views

Does 'Rubber Necking' happen after an accident?

When two cars get into an accident the cars around them need to slow down to avoid hitting the cars involved in the collision. This causes a backup in traffic. People have often told me that traffic ...
24
votes
3answers
2k views

Is premium fuel “better”?

Is there any evidence that premium and/or high-octane fuel (petrol/gas for cars): improves performance; and/or improves engine longevity; and/or improves mileage so that money is saved on fuel, even ...
21
votes
1answer
648 views

Do lower speed limits reduce gasoline usage?

There are three parts to this question: Does speed have an effect on miles-per-gallon? Is there a more accurate causal effect than speed that would also cause a connection at varying speeds? (perhaps ...
11
votes
2answers
1k views

Do the majority of people go 80 mph on the motorway?

I live in the UK, and my dad has told me "It is not possible to drive at 70 mph on the motorway. Everyone goes at 80 mph and [the police] don't care." When he says nobody he means the majority of ...
35
votes
3answers
3k views

Did car and oil companies actively try to suppress electric cars' development?

According to some (e.g. the documentary film Who Killed the Electric Car?), car and oil companies have actively tried to suppress electric cars' development. Electric cars seem to have technological ...
6
votes
0answers
687 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 ...
12
votes
2answers
1k views

Does lowering the legal BAC make driving safer?

Lower legal blood alcohol concentration limit laws are passed under the assumption that a lower legal limit will reduce the number of accidents. For example, the U.S government lowered the legal BAC ...
16
votes
3answers
60k views

Can you unlock a car using a cell phone?

I have heard that it is possible to unlock a car using the remote key-fob over a cell phone network. Scenario: Adam locks his keys in his car. He uses his cell phone to call his wife, Betty, who is ...
22
votes
3answers
3k views

Do automobile manufacturers make parts wear out and break easily, just so they can make more money?

It is sometimes heard that automobile manufacturers design low-quality parts that wear out or break easily, so that they can make money on the repair or replacement of these parts. I believe this to ...
24
votes
3answers
2k views

Why do we not have vehicles that meet or exceed the MPG ratings of vehicles that were available in the 1990s

I'm seeing some conspiracy theories making the rounds which claim that car-manufacturers are intentionally making cars that aren't as fuel efficient as they used to be. They often point to the Geo ...
14
votes
2answers
2k views

Platinum fuel saver

I've heard on the radio advertisements for a product called the Platinum Fuel Saver, that they claim that if you use it, you will increase fuel efficiency by 25%. What kind of data is there to support ...
88
votes
3answers
8k views

Does a car with a hybrid engine and Lithium batteries pollute more than a car with conventional technology?

You hear a lot of claims that, once you include manufacturing and battery replacement, hybrids pollute more than an efficient, more conventional engine. Are there any end-to-end studies measuring any ...