U-shaped closed route
An elongated closed route resembles a U shape. A U-shaped route can hardly meet the accuracy requirements. If conditions allow, users are advised not to choose such a route.
Single closed O-shaped route
The trajectory resembles an O shape, without redundant closed loops. The data calculation accuracy is good, which is one of the main requirements for route selection.
Multiple closed O-shaped route
The overall trajectory resembles an O shape, but with several closed loops. The data calculation accuracy in this case is the best. Such a route consists of several closed O-shaped loops, which significantly improves calculation accuracy and is the optimal route plan.
 |  |  |
| U-shaped closed route | Single closed O-shaped route | Multiple closed O-shaped route |