The Maths of Overtaking at a Pinch Point

An Attempt by KV03 YVB & Why I Stopped It.

1 second behind me at 15mph is ~ 7-8 yards, 2 seconds is 15-16 yards.
Bike length: 2 yards
Car length: 4 yards
Looking at satellite & clip, pinch points are 40 yards apart.

So to get the car from 1 second behind to 1 car's length ahead of me, the driver has the same time as it takes me to ride 22 yards, so less than 3secs. 40-bike-car-1sec-ahead by car length=22
This is still a very risky move, there should be more taken off.

That's an average of ~28mph. But to get that average starting from 15mph means has to end much higher than that, more like 40mph. (straight line acceleration through full 3 seconds.)

And that's assuming that this car can get to 40mph in 3 secs. Implies 0-60mph time of under 10secs! Probably much less!

Reason2: Needs to get to well above speed limit in a place where speed is meant to be reducing
Reason3: Car almost certainly could not do this, so would have to be far too close to even attempt it.
Reason 4: Would have to brake hard directly after to avoid other car

So pinch point overtakes are:
- pointless
- unsafe to people cycling
- unsafe to others around
- not even going to save drivers time

More about stopping bad moves: http://radwagon.co.uk/2012/05/common-...

The Maths of Overtaking at a Pinch Point clips for crocs
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Science & Technology	Upload TimePublished on 13 Jun 2012

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