i hate 20mph speed limits, most towns are at a snails pace - ok so at rush hour etc or weekends near retail parks.
most of the speed humps in this area are square ones which can be straddled by most cars, a bit of a bugger if you're on 2 wheels & you forget,
fines are a waste of time cos i aint been caught speeding for bloomin ages (now i've done it) 30 years+
bit like the phone issues for drivers - nobody to enforce it unless youre really unlucky.
no i dont ever use my phone when driving.
would it work NO not in my opinion
rant over