This Isn’t Driverless Cars, It’s Networked Cars, Reducing Congestion

Exactly the technology that is being considered is fairly important when we discuss the results of experimentation about new technologies. For example, I think driverless cars are going to be just great. But that doesn’t mean that this particular method by which they will reduce congestion is correct.

Driverless cars could speed up traffic flow and journeys by one third

Well, they might, but it won’t be for this reason:

Fleets of driverless cars on the roads could speed up traffic flow and cut journeys by a third, even for people who are not using them, a Cambridge University study suggests. Researchers programmed 16 miniature robotic cars to drive around a two-lane track and observed how the traffic flow changed when one of the cars stopped. When the cars were not driving co-operatively, any vehicles behind the stopped car had to stop or slow down and wait for a gap in the oncoming traffic, as would typically happen on a real road. A queue quickly formed behind the stopped car and overall traffic flow was slowed.

But when the cars were communicating with each other and driving co-operatively, as soon as one car stopped in the inner lane, it sent a signal to all the other vehicles. Cars in the outer lane that were near to the stopped car slowed down slightly so that vehicles in the inner lane were able to quickly pass the stopped car without having to stop or slow down significantly, and improving traffic flow and therefore journey times, by 35 per cent. And even when a human-controlled car was put on the track with the autonomous cars and moved around in an aggressive manner, the other cars were able to give way to avoid the aggressive driver, improving safety.

That’s not driverless cars, that’s networked cars. Sure, thy’re associated technologies, we’re likely to have both. But they are still different techs.

The difference is that driverless is, well, no human driver. The car is navigating and functioning on its own. The second is that it is networked into and communicating with the cars around it. They’re not the same thing at all. It’s possible for each driverless car to be entirely autonomous, all of them working on their own sets of sensors etc. Or we can indeed get them all talking to each other.

Driverless cars themselves I think unlikely to speed up journey times. Much more important is that they’ll make journey times less important. If you’ve not got to drive, thus can play, read, or sleep, then journey time itself is less important, no?

4
Leave a Reply

avatar
4 Comment threads
0 Thread replies
0 Followers
 
Most reacted comment
Hottest comment thread
4 Comment authors
TomOQuentin VoleThe MoleDodgy Geezer Recent comment authors
  Subscribe  
newest oldest most voted
Notify of
The Mole
Guest
The Mole

The problem is incentives matter, and in this case they showed that the human cars had an advantage as the driverless cars were giving way.

The second issue is as a professional I can’t see how the communications can be made secure and proofed against spoofing of signals – e.g. forcing cars to stop by pretending to be a stopped car in the road, or more subtle to allow you to overtake or do activist traffic calming!

Quentin Vole
Guest
Quentin Vole

The technology for driverless cars is probably a couple of decades away. And even when it can be made to work, it’ll probably be much longer before it actually appears on the roads. We’ve been capable of running driverless trains for a long time. How many are there actually operating?

Dodgy Geezer
Guest
Dodgy Geezer

Since the 1980s we have had a run of technological development in computing which we have embraced wholeheartedly without any concern for the downsides, or the ways in which the technology can be misused.

I wish that some consideration could be given to the way these ideas could be misused. For instance, networking cars means that the position of all road users is being constantly monitored, which has privacy implications. And the system could readily be weaponised to bring all traffic to a halt in the mother of traffic jams….

TomO
Guest

Making journeys quicker…?

Don’t take my word for it – go look at the time wasted by misconfigured / inappropriate traffic lights…. it’s up there with “smarter cars”.

If there were a case where AI / neural networks could be applied it’s surely traffic management.

There was a trial run in the UK (York?) I was told – where networked traffic senors and signals worked very well indeed…. (anybody got details?)