The safe braking distance depends on a number of factors (as noted by Jeep). I don't want to specify any numbers, but here are some important considerations.
1. The vehicle you drive, its speed and condition of its brakes/tyres.
2. Ditto for the vehicle you are following.
3. Visibility. Night/rain/fog reduce visibility and hence increase the reaction time required. Straight and wide roads afford greater visibility, since you have enough width to see ahead of the vehicle in front of you and also to swerve if necessary. E.g. following a bus closely at high speed on a narrow road is asking for trouble, big time. Give greater distance on ghat roads, because visibility is poor due to narrow and curving nature of roads. Hard braking at speed on curving ghat roads may cause your vehicle to skid out of control.
4. Condition of the road surface (wet/snow/muddy/bumpy).
5. Your driving skills. Good anticipation and correctly positioning your vehicle to afford maximum visibilty are vital. Skilled drivers can follow more closely at speed, but inexperienced ones will need greater braking distance. I was following an L-board Santro Xing lady driver in my own Santro on a narrow lane with a number of apartment gates on the sides. I immediately realized that the lady was driving too much to the left, very close to the gates and asking for trouble (idiot instructor did not apparently correct her). Sure enough, a two-wheeler guy cut into the road from an apartment gate in characteristic style and the lady stood on her brakes. Fortunately I had given her some distance *and* saw the bike cutting into the road ahead of her, and still had only just enough time to avoid rear-ending the Xing (which has superior brakes to my old Santro).
6. Driving skills/style of the driver whose vehicle you are following. Some drivers will follow the vehicles in front of them very closely at high speed and then frequently brake hard. Buses are notorious for this, but so are some SUV-taxi drivers, van drivers, etc. You can anticipate trouble in these cases because these are big vehicles attempting to go too fast on narrow roads. You should either quickly overtake these guys or follow them at a safe distance.
Some drivers will brake too early and unnecessarily hard as a matter of habit. Ladies, I hope you don't mind my putting you in this category. I don't mind rear-ending a lady while walking on a crowded street (just kidding, just kidding), but I don't want my car to rear-end hers. Follow them closely at your own peril.
Last edited by rks : 15th January 2008 at 20:19.
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