I see your point in that our roads arent even close to the standard they should be, but looking at the bigger picture i can kind of see the point to them. A high percentage of accidents happen in residential areas, narrow streets, normally with cars parked on them mean people step out at the last minute giving drivers very little time to react, meaning no time when speeding. If the cost of these units is in proportion to the number of accidents that it wil help prevent then im all for it, at the end of the day why do we need to speed in residential areas?
Just my thoughts, please dont hammer me for it