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