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Is there an easy way to learn stopping distances!
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# 1
pug_in_a_bed
Old 21-12-2009, 9:00 PM
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Default Is there an easy way to learn stopping distances!

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?
thanks in advance

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# 2
korny88
Old 21-12-2009, 9:11 PM
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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.
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# 3
HotLegs
Old 21-12-2009, 9:13 PM
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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.
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# 4
DaveMacD
Old 21-12-2009, 9:33 PM
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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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# 5
phunkeymonkey
Old 21-12-2009, 9:58 PM
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Quote:
Originally Posted by DaveMacD View Post
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...
That's exactly how I used to remember it. !!!!!!ed now that it's in meters - back to parrot fashion unfortunately
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# 6
Pew Pew Pew Lasers!
Old 21-12-2009, 11:34 PM
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Measured stopping distances are about the most !!!!ing stupid thing ever invented.
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# 7
computershack
Old 22-12-2009, 1:33 AM
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TBH, I'd be inclined to say it in feet. After all, it is still a valid unit of measurement in this country.
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# 8
Premier
Old 22-12-2009, 10:54 AM
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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.
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# 9
jaydeeuk1
Old 22-12-2009, 11:10 AM
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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.
With a paltry 90 brake horse power, hills in 5th gear can be power sappingly mundane and overtaking articulated lorries can become a long drawn out experience. Not my words Carrol, but the words of Top Gear Magazine
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# 10
Kilty
Old 22-12-2009, 11:15 AM
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The method shown for feet is fine - you get the options in metres and feet during the theory test.
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# 11
Premier
Old 22-12-2009, 11:19 AM
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Quote:
Originally Posted by jaydeeuk1 View Post
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.
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.
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# 12
Pew Pew Pew Lasers!
Old 22-12-2009, 1:04 PM
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Quote:
Originally Posted by jaydeeuk1 View Post
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.
It its tyres, not brakes, that determine stopping distances. Most people who brake in an emergency do not brake nearly hard enough.
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# 13
CHR15
Old 22-12-2009, 2:04 PM
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Quote:
Originally Posted by Pew Pew Pew Lasers! View Post
. Most people who brake in an emergency do not brake nearly hard enough.
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.
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# 14
pug_in_a_bed
Old 22-12-2009, 5:24 PM
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numbers aren't my strong point, back to the post its all over the house then...

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