Are directional railings good, or bad?

see the original article here.

THE Iloilo City Traffic Management and Engineering Unit installed directional railings along the Diversion Road supposedly to ease traffic in U-turn areas. But a number of jeepney and taxi drivers are complaining because, according to them, instead of making the flow of traffic smooth, it creates a bottleneck as not all vehicles are making U-turns in these areas. Only one lane is left to be shared by the many who are heading straight, thus clogging the road.

Such traffic infrastructure, drivers added, are only good if what Iloilo City has is a three-lane highway. One lane can be dedicated to those who wish to make a U-turn and two-lanes can be shared by those who won’t. But since what we have is only a two-lane highway, these railings should have not been put there.

But TMEU says putting a guide for those making U-turns reduces vehicular accidents considering that most drivers are not considerate enough to give way to others, thus, these railings institutes a one-vehicle-at-a-time rule. They also regulate the flow of traffic in the Diversion Road.