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Auto speed limiter for cars

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Auto speed limiter for cars

Old 11th Oct 2017, 18:02
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Auto speed limiter for cars

Since most car GPSs know when they are within speed limit zones and many cars are fitted with cruise control, would it not be a good idea to combine the two inputs to prevent busting of speed limits? Driving would then be less stressful.

Technically, all that would be needed would be a fuel flow limiter signalled by the GPS preventing the car from exceeding the speed limit regardless of accelerator/ gas pedal position.

The driver would have a simple ON/ OFF selector to control the system. ON would activate the system as described above. OFF would restore direct control of fuel flow to the accelerator/ gas pedal position.
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Old 11th Oct 2017, 18:08
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My car's Cruise Control doesn't function as a speed limiter (to my disappointment).

One problem with an absolute speed limiter (that cannot easily be over-ridden) would be if the driver 'needed' to increase speed to avoid a collision or similar.

Current models of my car do have a speed limiter which can be over-ridden by 'kick-down'.
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Old 11th Oct 2017, 19:13
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My car is fitted with a speed limiter; it occupies the front passenger seat and says "You're going too fast" when it believes that's the case.
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Old 11th Oct 2017, 19:18
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Whilst my car was being serviced on Monday, the courtesy car (a near-bottom of the range manual Toyota Yaris) had a neat little speed limit sign that popped up in the normal instrument panel, dead centre. If you were under the speed limit it displayed the sign as it appear by the roadside, with a white background, if you exceeded the speed limit the background to the sign turned red. It seemed very accurate, with the speed limits seeming to change as I was in line with the road signs.

It wasn't a speed limiter, as such, but seemed a helpful nudge to remind me to keep the speed down.

If they can fit something like this on a budget small hatchback, then it has to be feasible for it to be fitted to pretty much every car, I'd have thought.
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Old 11th Oct 2017, 19:35
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My BM's got a settable warning. Frightens the pant orf me. And, it shows a message on the road via the HUD. DONG!!!! Big circle and. YOU HAVE EXCEEDED THE SPEED LIMIT!!!

You set that by saying, Speed. and putting in the required warning, say, 65mph.

However, the cruise is the best gizmo, though I would like it to be aware of speed limits - though I expect later ones are.

Good thing about mine is I can see the cruise set speed in green and the actual speed in amber. When the speed is attained, the green changes to a picture of a needle on a scale.

Other good thing is, active braking. Good fun clicking the cruise stalk and getting the speed spot on by the limit sign. However, if you chicken out an touch the brakes, cruise is gone and the previous quite firm braking might be gone as well. A trap for the nerdy driver. Yes, I did fall in it.

My Fleetwood Broughm was the last of the biggies. 96, or thereabouts. Cruise very soothing, but go down hill and thirty could easily become 40 by the time you were cruising by the sheriff.
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Old 11th Oct 2017, 19:49
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My car (Jag F-Pace) has the following:

1. Normal Cruise Control - fixed speed as normal
2. Speed Limiter - set max speed, and whatever you do it won't exceed that speed
3. Intelligent Speed Limiter - (thinks it) knows the speed limit and modifies 2. above to automatically change the Speed Limiter to what it thinks the limit is - won't let you exceed it.

As I see it, the problems are:

1. Modes 2 and 3 won't allow you any discretion (eg. kickdown in emergency) without cancelling the mode (push of correct button)
3. Mode 3 doesn't always get it right, and won't allow you to override by say 2-3 mph, which would often put you at the correct mph limit.

As a result I tend to avoid mode 3, but often use modes 1 and 2 for convenience and licence protection!
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Old 11th Oct 2017, 19:52
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In isolation it would be a bad idea, our modern self entitled generation would simply drive everywhere with their foot on the floor.
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Old 11th Oct 2017, 20:07
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Since most car GPSs know when they are within speed limit zones and many cars are fitted with cruise control, would it not be a good idea to combine the two inputs to prevent busting of speed limits? Driving would then be less stressful.
A totally bizzare idea.. The whole point about safety is not bumping into things especially cars travelling close by, a great way to avoid this is to not have cars driving close by.
If everyone on the M way was driving at 70mph inevitibly due to minor differences they would find themselves all bunched together, door handle to door handle... like a 70mph car park looking for somewhere to have an accident.
If you find driving too stressful I suggest you stay off the roads.
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Old 11th Oct 2017, 21:09
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My stepfather was in vegas during a tech, mining, police convention. He asked the same question, and was told "we would lose all kinds of fines revenue"
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Old 11th Oct 2017, 21:25
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Originally Posted by Planet Basher View Post
In isolation it would be a bad idea, our modern self entitled generation would simply drive everywhere with their foot on the floor.
As I understand it, that's basically what European truck drivers do now they've been forced to install speed limiters.

It also wouldn't work too well. I drove a car in Holland which had a GPS that displayed the speed limit all the time, and it would often drop to a crazy low speed when driving on a major highway that crossed a local road. The GPS would at least have to be smart enough to figure out which road you were actually on.

And, yeah, fines. In many parts of the world, speed limits are just a way for the police to make money.
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Old 11th Oct 2017, 23:23
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One problem that I foresee with having the speed limited by GPS is that there might well be a temporary limit in place (roadworks for example) and there will without a doubt be many people who decide to rely on the system rather than following the posted limits and end up with speeding fines.

After all, I think many of us know people who go into moron mode when using a satnav and do whatever it tells them to do without ever questioning whether it's correct.
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Old 11th Oct 2017, 23:34
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Its too dangerous

Example car A travelling at 30 mph in a 40 Zone is overtaken by car B who accelerates to pass
Car A then accelerates leaving car B stuck on the outside and unable to pass as his acceleration ability is limited

In an ideal world yes but its far from ideal. Power itself equals safety
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Old 11th Oct 2017, 23:49
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TangoAlphad

I used to race formula Ford and Clubmans in my 20s and now fly business jets
Limiting speed or acceleration and hence correctly used power is itself a danger

As stated while you shouldn't break speed limits its not a perfect world and there will always be the occasion where that short burst of speed is your saviour
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Old 12th Oct 2017, 01:57
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Had a 98 model car without all the fancy gizmo,s on it,but it had a speed alert which could be set on whatever speed.Used to set it just above the speed limit and when you reached that speed it would set off a beep.
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Old 12th Oct 2017, 03:35
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Tsk, tsk, tsk - is everyone forgetting that GPS only gives you your ground speed, not your airspeed?

Oh....wait....
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Old 12th Oct 2017, 03:58
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All of the above have their merits and detractions.
Some systems are good. Others less so. Better ones still coming, I presume.

Me, I use cruise a lot, and also use the over-speed warning.
And I set it on the posted limit, not 9 k's over.

One thing to remember is that the vast majority of speeding convictions are against people who are knowingly and willfully driving in excess of the speed limit.
No (reasonable) amount of automation is going to change that if the automation can be over-ridden.

For sure, getting nabbed while inadvertently speeding does happen. I know this from personal experience. I thought that I knew the posted limit for the road section. I was wrong. An automatically adjusted over-speed alarm (not limiter) would have been handy in that case.
But all-in-all it is a pretty small risk.
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Old 12th Oct 2017, 04:40
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When I used to drive for Hallmark Cars out of the Gatwick base taking you guys all over the country, one regular trip was to the American Embassy taking crew up for their visas.

The Merc saloons we drove had both a cruise control (which I never used) and a speed limiter which was very handy. I would activate it at Hooley and it remained on all the way into Central London. The route is littered with speed cams which claimed many a driver.

I meant that I could concentrate on driving rather that looking out for cameras.
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Old 12th Oct 2017, 06:03
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Speed limiters have been in use in Norfolk for many years.....probably ever since the local population were introduced to mechanised transport in fact.

I have a very effective speed limiter.....otherwise known as my right foot.
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Old 12th Oct 2017, 06:48
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The missus will be collecting her new Citroen C3 Aircross next week and the brochure says it has tech that recognises speed limit signs and displays the info in the HUD.
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Old 12th Oct 2017, 08:12
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Originally Posted by sitigeltfel View Post
The missus will be collecting her new Citroen C3 Aircross next week and the brochure says it has tech that recognises speed limit signs and displays the info in the HUD.
So does the I/R come as part of the type conversion course then ?

And, are you aware of the labour costs for maintenance at all ?...."Multi-X" engineers don't come cheaply.....the coffee bill alone will be in three figures !.

Seriously though, not that I would be irreverent of course, quite why do cars need a HUD.
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