Sign boards for U-Turns are used only in cities! The gap in the median symbol is used only in highways i guess and we don need U-Turn signboards in highways!
The main use of the gap in median is to allow the other vehicles coming towards the main road to join in that main road and also caution the driver that a junction is coming ahead , the driver can either take an U-Turn there or if he is going straight then he has look forward to other vehicles coming and joining the main road!!
The other reason why is feel a gap in the median must be provided in cities for pedestrians to cross over , subways cannot be provided always! The reason i feel it is necessary in highways is if suppose a major accident has occurred in the highway line and blocking the entire route , the gap in the median can be used to divert the oncoming vehicles in the opposite direction to avoid delays in highways and huge traffic jams until the main line is cleared!!
Hope you get it now!
The main use of the gap in median is to allow the other vehicles coming towards the main road to join in that main road and also caution the driver that a junction is coming ahead , the driver can either take an U-Turn there or if he is going straight then he has look forward to other vehicles coming and joining the main road!!
The other reason why is feel a gap in the median must be provided in cities for pedestrians to cross over , subways cannot be provided always! The reason i feel it is necessary in highways is if suppose a major accident has occurred in the highway line and blocking the entire route , the gap in the median can be used to divert the oncoming vehicles in the opposite direction to avoid delays in highways and huge traffic jams until the main line is cleared!!
Hope you get it now!