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Because some (hopefully many) people will adhere to them, and if some cars adhere to the 20mph limit it prevents some others from exceeding it (whilst they're stuck behind them).
And it's way cheaper than actually enforcing them.
I've found when driving at 20 that almost all drivers tailgate, overtake dangerously and generally get right uppity.
Skülly-
I've found when driving at 20 that almost all drivers tailgate, overtake dangerously and generally get right uppity.
If you drive at the speed limit the majority of behaviour you'll see is people driving badly. You'll have very little interaction with other people patiently sticking to the 20 limit precisely because they won't be going past you or trying to get past you.
Greenbank
Because some (hopefully many) people will adhere to them, and if some cars adhere to the 20mph limit it prevents some others from exceeding it (whilst they're stuck behind them).
And it's way cheaper than actually enforcing them.