The Mudcat Café TM
Thread #165036   Message #3956457
Posted By: Mr Red
13-Oct-18 - 01:04 PM
Thread Name: BS: 'Not so Smart' Motorways.
Subject: RE: BS: 'Not so Smart' Motorways.
A policeman once told me that a sudden stop, like an accident across all lanes, cause the tailback to shoot back up the motorway at 60mph. If you think about it, if the average speed is, and is, 65mph then the growth of a tailback is only a smidgen less that the average.

Tailbacks that appear without apparent cause are a symptom of a motorway nearing capacity. Something like a stupid driver lane changing without warning and people slow down, and near capacity there is little opportunity to drive round the problem in any part of the growing tailback. If they did they would cause a snowball effect. It needs time for people to respond and it is coming at them at 60mph head on!