| Exhaust | |
| Damper | |
| Hydraulic | |
| Engine |
| In a variety of ways to make sure that nothing is missed | |
| The same way every time | |
| Only by a qualified mechanic | |
| By alternating the items checked during each inspection |
| Maintenance mechanic | |
| Driver | |
| Federal and state inspectors | |
| Trucking company |