| Safe for all conditions | |
| Safe for buses, cars can exceed this speed | |
| Safe for cars but not necessarily for buses | |
| Safe for both cars and buses |
| Allow riders to exit using any door or window in an emergency | |
| Allow the driver to move freely and easily | |
| All of these are correct | |
| Avoid damage |
| A four-inch triangle | |
| A four-inch diamond | |
| A four-inch square | |
| A four-inch circle |