What's worse for the environment: driving 20 miles on the South Circular (low speed, lots of stopping), or 50 miles on the M25 to reach the same destination?
M25 better just to keep the fumes out of the city?
Assuming you're not foot to the floor on the motorway, I would presume the stop/start is worse.
Oh, except you said M25, which is a fucking carpark and will be stop/start anyway :)
@hippy started
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What's worse for the environment: driving 20 miles on the South Circular (low speed, lots of stopping), or 50 miles on the M25 to reach the same destination?
M25 better just to keep the fumes out of the city?