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