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Traffic calming for rat run on Devonshire Rd
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andrewr


Posts: 296
Joined: May 2006
Post: #1
23-04-2010 09:19 AM

I absolutely agree with tripandfuschia's comments about the views of non-drivers and those in adjacent roads being of importance and also those of shaman on the hazards of the right turn out of Devonshire onto the SC. However, I think it is unrealistic to expect Devonshire Road to become a quiet backwater - unless people can be forced out of their cars, that could only be achieved by a significant increase in traffic elsewhere. Is that reasonable for the people who live on the roads that will see an increase in traffic?

Apparently traffic analysts always use the 85 percentile traffic speed figure on the grounds that:

The 'tail' of vehicles in the top 15% inevitably includes erroneous readings and also the relatively few vehicles that will not be slowed down, whatever restrictions are in place. By looking at the speeds recorded of the slowest 85% a more realistic view is obtained of normal traffic speeds.

Note that the 85% figure is the speed that 85% of vehicles are going slower than. It does not tell you what the average speed is. In principle it would be possible (if unlikely) for only one vehicle of the 85% to be doing 24mph whilst all others are below 20mph, but still to have an 85%ile speed of 24mph!

We may not be happy that many drivers exceed the speed limits by a margin, but it is, for the moment an accepted fact of life in the UK. In a 30mph zone it is extremely unlikely that you will be prosecuted for doing up to 36mph - a similar margin to 24 mph in a 20 zone.

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RE: Traffic calming for rat run on Devonshire Rd - andrewr - 23-04-2010 09:19 AM

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