Why? If you need a band aid-what's wrong with cruise control? What do you set the speed limiter to-70mph? How does that stop speeding in 30? What about temporary speed limits that haven't been logged with the GPS system? Who would be liable if the speed limiter permitted speeding? What about inclement weather conditions etc etc?
Driving is about observation. You can't automate that-and automation tends to lead to driver disengagement. Anyone disinclined to be observant needs a bus pass, not a gadget.
(sigh) I suppose you poo poo parking sensors as well...
In a modern car in 4th or 5th , unless you have your eyes glued to the speedo all the time, its all too easy to drift up over a 30 or 40mph limit especially when being haranged by tailgaters, distracted by wife/kids or being just a little too tired. Spending up to 50% of your time staring at a speedo is a dangerous pastime.
Many urban roads I can think of e.g. going through town centres, villages etc, cruise control is not appropriate - you definitely would not be in control
The thing I liked about the Citroen limiter was it worked just like a cruise control - you simply pushed a button to set the limit , but unlike cruise, it allows you to go at any speed slower than the set limit, even stop, and just silently didnt let you exceed the limit you set. Manual feathering of throttle and constant eagle eyed monitoring of speed not required. For safety, if you floored it, a kickdown feature overides it allowing an emergency manouver, but this has to be a definite to the floor action.
I can see this being a real benefit - e.g when going into and around town, just set it at 30 or 40 and just drive and dont spend half the time staring at the speedo because you know there is likely to be a speed van parked down the road.
Just an extra couple of buttons and some ecu code, similar to cruise but different.
In 40 years of driving, I've never been done for speeding (touch wood) and I try to stay below the limit at all times, but sometimes its difficult not to suddendly find you've drifted 10%+1mph too high and its usually the areas beloved by speed vans.
Speed vans are unforgiving money machines - 35mph in a 30, 46mph in a 40 etc and you'll get a fine, points and an expensive hike in your insurance that stays with you for 3 years at least.
Unthrottled, try it and see. Keep an open mind. I'm anti french cars but the Citroen implementation of this simple idea seems very good.
GPS controlled limiters - properly implemented with the ability to overide etc would be an excellent feature.
Waffle about temporary speed limits or liabilty etc etc is typical unthrottled garble - of course its still the drivers responsibilty to check his speed.
I of course advocate all cars in the UK should have a mandatory top speed of 80 mph.
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