Sharp turns definition

We have a couple of categories to identify a sharp turn as follows:

| | |
| --- | --- |
| Very sharp turn | turn that is very difficult or even not feasible for long trucks |
| Medium sharp turn | turn that is rather feasible even for long trucks however it requires driver to slow down considerably |

Well,

Sharp angles model below is defined from right-hand side driving perspective. In case of left-hand side driving thresholds are to be symmetric.



Sharp turn angle thresholds:

| Threshold | Turn Angle Range when turning to FC5 | Turn Angle Range when turning to FC4 or greater |
| --- | --- | --- |
| medium sharp passenger-side turn | n/a | >75° |
| very sharp passenger-side turn | >80° | >95° |
| medium sharp driver-side turn | >80° | >100° |
| very sharp driver-side turn | >95° | >120° |
| driver-side u-turn on single link | 180° | 180° |
| driver-side u | | |

NOTE: Thresholds take into account also limited precision of (~5° error) road geometry map data in case of very sharp turns to don't filter out most of junctions (perpendicular junctions are common). So i.e. very sharp right turn should be 95°.