« on: 19/07/2021 19:45:14 »
Not sure I follow. The Highways Agency "logic" is to retrofit concrete barriers on roads with significant rapid traffic, regardless of accident rates. In doing so they need to close a lane and restrict the speed of traffic in other lanes. My question is, quite simply, if it ain't busted, why fix it, if fixing it means causing congestion and possibly (usually) increasing the accident rate in the constricted area.Accidents that happen when everyone is going in the same direction can be bad, but they are as nothing to what happens when a car leaves a carriageway and ends up going into traffic travelling the other way. The concrete dividers are designed to bounce the cars back into their own lane, and generally have better outcomes.
Without a concrete divider, if a car does end up entering the opposite lane, if the traffic rate is low, then the chances of a nasty accident is much lower anyway. So you only replace them on the high flow rate roads where the relatively expensive equipment does the most good.