It increases rollout costs of the 20 zone, as now you need entry signs on every side road, exit signs when leaving the zone, and reminder signs. Also, it gives you a better excuse when caught speeding.
What it does do is make it safer to walk on the road, which makes passing cars parked in demi-drives easier.
Which is handy, as the foreshortened gardens of Portsmouth are not big enough to park cars, so where someone has managed to get council clearance to knock down the wall, you can't get four cars in the garden except demi-drive style.
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The retention of 30 mph speed limits on some arterial routes might be acceptable if the quid-pro-quo was that the 30 mph limit was rigorously enforced.
If even touching 30 mph triggered a penalty, as it should, motorists would have to drive at around 25 mph to avoid drifting over the limit. 25 mph would be a big improvement on the 30-35 mph that mostly prevails on such routes and would be only marginally faster than what would be expected in the 20 mph zones where there isn't any enforcement.
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