Can you use active cruise control on A roads?

Can you use active cruise control on A roads?

Author
Discussion

Ari

Original Poster:

15,724 posts

163 months

Tuesday 19th November
quotequote all
This may be a stupid question, but I've always thought that active cruise control (where if you're set at 70mph and come up behind a car doing 68mph it slows to match speed) is really for motorways. But can you use it on a normal A road?

In other words, could you give the car a quick burst to 70mph, hit active cruise, and as you reach the back of the car in front it would adjust to that car's speed (as is lower than set) and then simply follow it, letting the car in front effectively do all the driving bar steering because your car would be speeding up and slowing down as his/hers did?

It's just an idle muse, I've never driven a car with it.

sjg

6,209 posts

213 months

Tuesday 19th November
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Yes.

Hitch

5,636 posts

142 months

Tuesday 19th November
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Yes, I use it all the time.

AC43

7,381 posts

156 months

Tuesday 19th November
quotequote all
Ari said:
This may be a stupid question, but I've always thought that active cruise control (where if you're set at 70mph and come up behind a car doing 68mph it slows to match speed) is really for motorways. But can you use it on a normal A road?

In other words, could you give the car a quick burst to 70mph, hit active cruise, and as you reach the back of the car in front it would adjust to that car's speed (as is lower than set) and then simply follow it, letting the car in front effectively do all the driving bar steering because your car would be speeding up and slowing down as his/hers did?

It's just an idle muse, I've never driven a car with it.
Yes I used it extensively on holiday in France on August. On motorways and A roads.

Dave Hedgehog

11,867 posts

152 months

Osinjak

2,436 posts

69 months

Tuesday 19th November
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I actually find it more useful on A roads. My ACC leaves a huge gap in front and when on a motorway I often find people behind me getting pissed off because I'm not 'getting a move on' and end up going around me, filling the gap in front of me and forcing the ACC to reduce speed to maintain the gap. Less of a problem on an A road as people behind are less inclined to overtake and speed is also more variable than a motorway so makes for more relaxing progress. I've even used it on B roads occasionally.

phil4

533 posts

186 months

Tuesday 19th November
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Yes, have used it daily on such roads since my 2014 VW Golf.

It seems to work better when in a constant flow of traffic, speeding up and slowing down as per the car in front. It doesn't like spotting stationary objects when going at high speed, so I usually intervene then. Likewise cars turning off, just give it some gas to go past.

Edited by phil4 on Tuesday 19th November 14:33

novus

111 posts

108 months

Tuesday 19th November
quotequote all
Osinjak said:
I actually find it more useful on A roads. My ACC leaves a huge gap in front and when on a motorway I often find people behind me getting pissed off because I'm not 'getting a move on' and end up going around me, filling the gap in front of me and forcing the ACC to reduce speed to maintain the gap. Less of a problem on an A road as people behind are less inclined to overtake and speed is also more variable than a motorway so makes for more relaxing progress. I've even used it on B roads occasionally.
Change the gap distance setting assuming you can on your particular car

Ari

Original Poster:

15,724 posts

163 months

Tuesday 19th November
quotequote all
That's fantastic! I quite often do a long journey that is mostly busy A road, and there is nothing to do but sit patiently behind the car in front and match its speed. If the car can do that for you, brilliant!

Many thanks.

Ari

Original Poster:

15,724 posts

163 months

Tuesday 19th November
quotequote all
Dave Hedgehog said:
That's interesting but I'm guessing the systems fitted to a Tesla are far more sophisticated than on (for example) a VW Golf.

WJNB

2,094 posts

109 months

Tuesday 19th November
quotequote all
Together with a decent sound system, a good automatic gearbox & air conditioning, cruise control, active or otherwise, is vital to relaxing comfortable driving.
Over the years I've encountered many that are vocal in their denigration of such things & upon close questioning they have never experienced them. This is either because there employer has always lumbered them with the basic bog standard company issued car, or in the case of some males the they think it's terribly macho & manly to fiddle around with a gear knob, be overheated & enjoy leg & back ache on long motorway journeys.


foggy

886 posts

230 months

Tuesday 19th November
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Yep, and teamed with an auto transmission a lot of the modern ones will work right down to a complete stop. Absolutely brilliant for stop-start queuing traffic.

Mine does quite a lot of the steering for you too - I’d be reluctant to have a daily driver without ACC and steering support nowadays for daily grind driving in the south east. My missus loves it too.

C.A.R.

3,570 posts

136 months

Tuesday 19th November
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If it has active lane assist this will work too, provided the white lines are visible enough and the corners aren't too sharp.

It's great fun incredibly dangerous second-guessing whether it will hold the lane around a corner or not.


Alucidnation

10,771 posts

118 months

Tuesday 19th November
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Not that good when approaching traffic lights and the car in front guns it through on amber.

donkmeister

1,857 posts

48 months

Tuesday 19th November
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foggy said:
Yep, and teamed with an auto transmission a lot of the modern ones will work right down to a complete stop. Absolutely brilliant for stop-start queuing traffic.
I find the VAG one great for that on the M25. It occasionally gets a bit jerky if the person in front is someone who creeps forwards 6" at a time or rolls back and forth on the clutch.

I don't have it on my car but it is a feature I'll look for if/when I replace it.

Osinjak

2,436 posts

69 months

Tuesday 19th November
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novus said:
Change the gap distance setting assuming you can on your particular car
Been there, done that.

Dont like rolls

549 posts

2 months

Tuesday 19th November
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Yeh, you can all slot in behind a truck and block ANY overtake.

ACC on A roads is for the lazy and ignorant.

Hoofy

69,521 posts

230 months

Tuesday 19th November
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What happens if you're "locked on" to a Caterham and it takes corners far quicker than your vehicle could? biggrin

Rawwr

22,526 posts

182 months

Tuesday 19th November
quotequote all
Dont like rolls said:
Yeh, you can all slot in behind a truck and block ANY overtake.

ACC on A roads is for the lazy and ignorant.
lol

Camelot1971

1,444 posts

114 months

Tuesday 19th November
quotequote all
I don't particularly care for it on the motorway, unless traffic is really busy and it's stop/start - really helpful then. I mostly use mine on A roads where the limit keeps going 30/40/50 and back again and just use the adjustment to move my max speed up or down depending on need. It's definitely not a "once and done" system though, or something that means you can just switch off to whats going on around you.

Of course, those who tell you it's rubbish have either never tried it (using how it's intended) or are too stupid to understand it. wink