CALIFORNIA • SEMITRAILER WORKSHEET
Two-thirds rear overhang
Enter the axle spacings below to calculate the rear-overhang limit under California Vehicle Code §35410.
Measure the right wheelbase. For a semitrailer, use the distance from the tractor’s rearmost axle to the semitrailer’s rearmost axle. Tractor axle spacings ahead of that starting point are excluded. Measure each spacing from axle center to axle center.
1. Axle spacings
Number all axles from front to back, starting with axle 1 at the front of the truck. Enter feet, inches, or both. Decimal inches are accepted. Only spacings from the tractor's rearmost axle to the trailer's rearmost axle count toward the legal wheelbase.
Maximum rear overhang
Enter axle spacings
Legal wheelbase × ⅔
The result is measured behind the last point supporting the load—not behind the rear axle. Displayed feet and inches are rounded down to the nearest ⅛ inch so the displayed allowance does not exceed the calculated limit.
2. Optional: check actual overhang
Last point of support to rear end of load
Enter actual rear overhang to compare it with the calculated limit.