clevedon:KiwiNZ:clevedon:KiwiNZ:clevedon:KiwiNZ: Best device on a car to stop speeding is the cruise control
Doesn't work going downhill and keep you at the speed limit though.
It does when descent control is installed and used correctly. If the vehicle does not have descent control then it has to be driver controlled to maintain safe and or legal speed.
Descent control is not designed for open road driving, it's for mainly slippery or rough downhill terrain offroading.
Incorrect, it is appearing on most modern cars, it is brilliant at assisting with hill descent.
On just about any vehicle hill descent control will not work above about 35km/h - not very handy on the open road. And I haven't seen HDC on any two wheel drive vehicles.
On our SUVs it is a button push activation, on my wife's last car it was automatic, if she took her foot off the brake and accelerator the vehicle would maintain revs at optimum for the descent speed ( agreed that is an off reading must) but uses the vehicles ABS system and stability control to apply braking to maintain descent speed an control. Very useful in automatics, manuals not so as it is better to downshift and upshift to achieve this.
A lot of drivers have lost the ability to control descent since the prevelence of automatic transmissions, most allow gravity to dictate terms and only use the brakes to control it, a very dangerous practice.