1 天气Rainy, Snow, Slippy
2 环境 T Intersection, Uphill, Downhill, Winding Road, Hidden Driveway,Cross walk Parking Lot Exit, Narrow Road, Construction Zone
3 信号 Stop Sign, School Zone, Playground Zone, Right Lane Ends Ahead Merge Traffic
4 路旁 Truck, Car, Tree, Hidden Exit, Driveway
5 周围 Coming Car, Bicycle, People
6 动物 Animal Dog/Cat People Playing Team