Quote:
Originally Posted by ebuilder
No one who designs roads or studies traffic would ever make any such claims about driverless cars. Tech addicts believe the source of EVERY problem is the fact that a computer isn't doing something. The notion that congestion is based on human error makes no sense whatsoever. Congestion is about capacity and volume of cars- it doesn't matter who is driving the car. You can replace all humans with bots and 76 will still be jammed. Human drivers are already pretty adept and driving only a few feet behind the another car. When volume is low, humans have already figured out how to drive faster and better utilize the open space. Even if we believe the pie in the sky utopian vision of how this all looks what is being promised is an era of near 24/7 congestion where computer driven cars are spaced 6in apart and area roadways are packed to max capacity at all times in the name of "efficiency".
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There are so many factors you're not accounting for here and I think it's leading you to make a mistake in the ability of the self-driving cars to reduce congestion. Self driving cars have reaction times to sudden breaking events that are 1/3 those of drivers in a best case scenario for human drivers. That's a difference of 20 meters of stopping distance.
Self-driving cars also have perfect lane discipline, in that they do not drift between the lines in their lane but drive in a relatively perfect line. The maximum allowable width for a vehicle is 8.5 feet which includes oversized vehicles, but for standard vehicles it is 8 feet, whereas highway lane width is standardized at 12 feet. Taking 2 feet from the shoulder and reducing lane widths by 3-4 feet in congested areas would allow for formation of a third lane on most two lane highways.
So we can have cars follow each other more close, drive more closely together due to elimination of lane drift which may allow for more lanes. A third benefit is that the cars will accelerate more uniformly eliminating phantom traffic jams entirely.
Self-driving cars can also operate at speeds much greater than humans due to their reaction times, which increases the total throughput volume of highways. There will also be drastically reduced congestion in urban areas due to the fact that no one will be circling for parking. The car will simply drop you off and then pick up the next passenger, or proceed to some remote location for storage.
Of course, one of the largest savings in traffic will be the near elimination of traffic accidents. All of these things will be further improved with inter-car communication protocols that the SAE is finalizing. Unfortunately we will not reap all of these benefits until all human driven cars are off the roads.
Related to self-driving car adoption, I don't think the hurdles to adoption are as large as people think they will be, particularly due to the lower cost to consumers they will represent. Many people are viewing traditional ownership models for self-driving cars, but that is not necessarily the model manufacturers are pursuing. Instead you will likely lease access ridership rather than owning a vehicle. A single car can realistically service at the very minimum of 5 times the amount of riders they do now, due to the amount of time they spend idle. This model will lead to drastically lowered costs per user. The average US citizen spends $8500 a year on their cars, and it's a low bar for a program that leases access to rides to come in significantly under that amount due to optimizing the road time of the vehicles. Think of it like a giant Uber/Lyft service maintained by car manufacturers. Prices won't go up. People will likely first eliminate second vehicles in favor of such ride sharing, and once their existing vehicle ages out they'll likely shift over entirely. Once enough drivers start shifting over the upward pressure on car insurance rates for human drivers will push more and more drivers into self-driving car adoption.
It will still take a decade or two, but that's fine because we don't need massive adoption immediately to reap immediate benefits for things like parking and some forms of reduced congestion. If you can eliminate 10% of the cars on the street in the first 5 years the benefits would be incredible.
And I think that's enough of a derail on this thread from me!