Britain to Pilot GPS Speed Governors

Rich0 writes "In a new twist on traffic speed enforcement, The Times is reporting that Britain is piloting a new device which will use GPS to actively prevent speeding. The device will initially be offered in conjunction with discounts to the London congestion surcharge." From the article: "A study commissioned by London's transport planners has recommended that motorists who install it should be rewarded with a discount on the congestion charge, which tomorrow rises to £8 a day. The trial Skodas were fitted with a black box containing a digital map identifying the speed limits of every stretch of road in Leeds. A satellite positioning system tracked the cars' locations. "

Comments

Re:Doesn't slower speed increase congestion?

[BiggerIsBetter]

Actually, traffic does behave like a liquid... kinda...

The traffic simulations I've seen use a particle model to work out traffic flows. The idea being that people over and under estimate the speed of their own car, and others on the road. The result of this is each car "vibrates" against others (with a certain air gap, hopefully).

The result of *that* is that traffic tends to slow *more* than the slowest driver would travel at. Which is why you get congestion at points of merging and corners for no apparent reason - nervous/careful people slow down, and it cascades into a near stop for everyone else.

Side note, slowing traffic down "for safety reasons" is inane. Traffic will slow itself down as volumes increase (eg, peak times) all you engineers have to do is make the road flow smoothly.