1. interstate highway 15. passenger car
2. exit ramp 16. camper
3. overpass 17. sports car
4. cloverleaf 18. center divider
5. left lane 19. motorcycle
6. center lane 20. bus
7. right lane 21. entrance ramp
8. speed limit sign 22. shoulder
9. hitchhiker 23. road sign
10. trailer 24. exit sign
11. service area 25. truck
12. attendant 26. van
13. air pump 27. tollbooth
14. gas pump