kingpin to rear axle
English
![](Images/wiktionary/MUTCD-CA_R20-1.svg.png.webp)
Kingpin to rear axle length restriction road sign
Alternative forms
- KPRA
Etymology
kingpin + to + rear + axle
Noun
kingpin to rear axle (plural kingpin to rear axles)
- The distance from the kingpin to the rear axle of a semi-trailer truck, a standard measurement used in truck length restrictions on roads.