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California Heavy Haul

  • Writer: Z-factor Consultation
    Z-factor Consultation
  • Jun 22, 2020
  • 1 min read

Updated: Aug 16, 2020

The amount of weight allowed with steerable lift axles can be found in a document referred to as “Extra Legal Weight, Charts “Orange, Green or Purple”. https://dot.ca.gov/programs/traffic-operations/transportation-permits/weight


California does not recognize a pusher, but when two Air Ride Suspension drive axles are coupled with a lift axle and the spacing of all three is equal, they have a Tridem Bonus application. This is a permitted load, not part of Federal Bridge.  


The Purple Chart documents the lift and drive axles regulations and all these axles require 4 tires per axle to qualify for the bonus weight. Given that, my evaluation is below.


Steerable lifts with wide base tires and 54” axle spacing:

straight weight ground load of 51,450


Dual mounting with 54” spacing between all axles:

bonus (additional 7,718) 59,168 lbs. total


Steerable lifts with wide base tires and 60” axle spacing:

straight weight ground load of 52,500


Dual mounting with 60” spacing between all axles:

bonus (additional 7,875) 60,375 lbs. total  



See the two documents for details, it is more complicated that I’ve noted above.



And now.....

Believe It OR Not




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