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• FIRST POST
• pug_in_a_bed
• 21st Dec 09, 9:00 PM
• 1,941Posts
• 907Thanks
pug_in_a_bed
Taking my theory in a few weeks and I just cannot learn the stopping/thinking distances, if their a formula or anything that can help me?

Page 1
• korny88
• By korny88 21st Dec 09, 9:11 PM
• 119 Posts
• 49 Thanks
korny88
Haven't got an extra special memorable way to remember but always helps to write it down yourself.

But hope you have good luck in your test.
• HotLegs
I can't help much either although the night before my theory I did an online theory test over and over until I couldn't keep my eyes open and I passed with 100%, good luck.
• DaveMacD
There used to be a way to remember it in old money, but having the new distances in metres sort of knackers it.
Your base was 20 mph x2 = 40 feet
30 x 2.5 = 75 feet
40 x 3 = 120 feet (they convert it to 118, but it used to be 120 in the old versions)
50 x 3.5 = 175 feet
60 x 4 = 240 feet
70 x 4.5 = 315 feet

The only easy thing about the distances now is that the thinking distance goes up by 3 m per 10 mph...
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• phunkeymonkey
• 21st Dec 09, 9:58 PM
• 17 Posts
• 28 Thanks
phunkeymonkey
There used to be a way to remember it in old money, but having the new distances in metres sort of knackers it.
Your base was 20 mph x2 = 40 feet
30 x 2.5 = 75 feet
40 x 3 = 120 feet (they convert it to 118, but it used to be 120 in the old versions)
50 x 3.5 = 175 feet
60 x 4 = 240 feet
70 x 4.5 = 315 feet

The only easy thing about the distances now is that the thinking distance goes up by 3 m per 10 mph...
Originally posted by DaveMacD
That's exactly how I used to remember it. !!!!!!ed now that it's in meters - back to parrot fashion unfortunately
• Pew Pew Pew Lasers!
Measured stopping distances are about the most !!!!ing stupid thing ever invented.
• computershack
TBH, I'd be inclined to say it in feet. After all, it is still a valid unit of measurement in this country.
• Premier
Overall stopping distance = thinking distance + braking distance.

thinking distance (in feet) = speed (in mph)

braking distance (in feet) = (speed (in mph) / 20) x speed (in mph)

so:

overall stopping distance (in feet) = speed (in mph) + ((speed (in mph) / 20) x speed (in mph))

1 foot = 0.3048 metres

... but personally I always find it odd to expect a stopping distance in metres when you are discussing a speed in miles per hour.

[ Simple way to do the calculation in your head (for imperial measurements):
Think of a number/speed,
divide it by 10
divide it by 2
multiply by the number you first thought of
add the number you first thought of
]
Last edited by Premier; 22-12-2009 at 10:56 AM.
• jaydeeuk1
• 22nd Dec 09, 11:10 AM
• 7,455 Posts
• 4,942 Thanks
jaydeeuk1
Stopping differences completely different a high powered sports car, a huge 4x4 and an old ford escort.

High powered sports cars have far better brakes/suspension than your average family car allowing for much shorter breaking distances. Perhaps all round disc brakes should be made compulsory for all new cars. But then that might reduce accidents and therefore result in fewer speed cameras / income for the Govt.
• Kilty
The method shown for feet is fine - you get the options in metres and feet during the theory test.
• Premier
Stopping differences completely different a high powered sports car, a huge 4x4 and an old ford escort.

High powered sports cars have far better brakes/suspension than your average family car allowing for much shorter breaking distances. Perhaps all round disc brakes should be made compulsory for all new cars. But then that might reduce accidents and therefore result in fewer speed cameras / income for the Govt.
Originally posted by jaydeeuk1
Yes, it's amazing how many drivers of fancy cars on the motorway think they can stop safely from 70mph (or more!) in 20 feet or less.
• Pew Pew Pew Lasers!
Stopping differences completely different a high powered sports car, a huge 4x4 and an old ford escort.

High powered sports cars have far better brakes/suspension than your average family car allowing for much shorter breaking distances. Perhaps all round disc brakes should be made compulsory for all new cars. But then that might reduce accidents and therefore result in fewer speed cameras / income for the Govt.
Originally posted by jaydeeuk1
It its tyres, not brakes, that determine stopping distances. Most people who brake in an emergency do not brake nearly hard enough.
• CHR15
• By CHR15 22nd Dec 09, 2:04 PM
• 4,835 Posts
• 4,169 Thanks
CHR15
. Most people who brake in an emergency do not brake nearly hard enough.
Originally posted by Pew Pew Pew Lasers!
Agreed, which is why a lot of manufacturers introduced EBS (Emergency Brake Assist). Even my old 2001 Mondeo had it.

Give the brakes a good hard stab and the car takes over and brakes even harder.

With ABS too, just stamp the pedal through the floor, you can still turn too which is something else people forget to do when hurtling toward the back of a van.
• pug_in_a_bed
• 22nd Dec 09, 5:24 PM
• 1,941 Posts
• 907 Thanks
pug_in_a_bed
numbers aren't my strong point, back to the post its all over the house then...

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