| Driving close to the center line will get you a few more inches of clearance | |
| If you`re carrying a lighter load your required clearance may be more than you think | |
| You should assume that this posted clearance is correct | |
| If you`re carrying a heavier load your required clearance may be more than you think |
| Trucking company | |
| Federal and state inspectors | |
| Maintenance mechanic | |
| Driver |
| Twice - at the beginning and the end of the trip | |
| Once an hour | |
| Every 300 miles or every 6 hours | |
| Every 150 miles or every 3 hours |