Road Speed Limiter and Warning

Unfortunately in Switzerland I often encounter wrong limits, the car shows 30, where it is 50, or even 50, where it is 120! So a locked speed limit (for the youngsters) would really be dangerous on certain roads, as the car would drive way too slow. But I like Ferrycraigs description.

I appears that the biggest concerns people have about speed limiters, is that they believe, once set, it is not possible to exceed the limit set. This is NOT the case. In my Merc, the speed limiter can be set to any speed you want. It restricts you to that speed, in much the same way as Autopilot restricts you within lanes, provides resistance but can be overridden easily. The limiter is a voluntary thing. YOU select if you want to use it, YOU select the speed limit, and YOU select if you want to override it. I have only ever once wanted to override it, when I was approaching some traffic lights and I was worried they were going to change to red before I got there. Easy, foot down, zoom to lights, re-apply limiter once through the lights. On the other hand I have frequently smiled as I came round a corner, past someone with a mobile speed gun, in the knowledge the other drivers were getting the fines and the points and I wasn't, regardless of how fast I sped away from the lights.

Since speed limits are known to navigation systems (I saw this on a TomTom), it would be really useful if the car alerted me when I am traveling a defined mph over the speed limit of the street I'm on.  This would be adjustable, just like the automatic lowering is adjustable.  I, for example, would ask the car to alert me when I'm going more than 10 miles per hour over the rated speed limit for the road I am on.

Very good thoughts and comments! Beside the possibility to set a max speed limit I would personally very much like to see the possibility to reduce the power of the engine, so that the acceleration of the car is reduced. It doesn’t help much to reduce the top speed of the car if the acceleration still let the car go out of the hand of a less experienced driver.

Speed warning with increasingly lud warnings as speed increases, and perhaps even notification to owner by SMS would probably limit most kids from playing too much, while not getting them in an accident for maxing out at 60 while passing a truck (like mentioned above).

I would just want the speed warning function.  Many cars already have this.

My Nokia Lumia 800 GPS based Navigation App is able to schow me the allowed speedlimit and warn me if I'm driving to fast. It's just a must have for car like this.

Also seems to be a similar topic to these ideas:

• selection of driving modes… i.e. winter, super sport, economy


• option to have less power/acceleration
  
  
  
  • double tap accelerator pedal to temporarily disengage
  
  
  • or, alter mapping of pedal… i.e. have to push further to get to power-band
  
  
  
  

i was also considering a feature like this - i was considering it a "governor" with multiple forms of aggressiveness:

• Valet mode - drastically limit top speed and reduce acceleration curve


• Child mode - limit top speed and acceleration (variable!)


• Speed limit warning(s) - audible beep at set(variable) speed as compared to actual/posted speed limit  (utilizes NAV data)


• Speed limit enforcement - does not allow vehicle to go X(variable - per user) mph over speed limit.  double tap accelerator to override for emergency/evasive situations

The GPS-based warning (not limiting) is a standard feature in all sat nav systems I came across recently, including Navigon. Since Tesla uses Navigon for turn-by-turn navigation, the feature may actually be already present (for cars that have the Tech Package), or can be expected to be included soon.

I would like to suggest splitting this item into two, one for actually limiting the speed/acceleration, and a separate one for warning when exceeding speed limits. Although the items look similar, use cases and implementation are quite different.

Related item: Guest/Valet/Car Wash Modes