| Grenades | |
| Propane | |
| Oxygen | |
| Emergency medical supplies |
| A four-inch diamond | |
| A four-inch square | |
| A four-inch triangle | |
| A four-inch circle |
| Should be discharged at the next available safe stop | |
| Can be discharged anywhere along a bus` route | |
| Should immediately be removed from a bus | |
| Should be discharged in an out of the way area |