About Smart Lift Axle Permits

Carriers can now apply for a permit to allow the use of Smart Life Axles on designated Safe, Productive, and Infrastructure-Friendly tractor semi- and double-trailer configurations under Ontario Regulation 413/05, Vehicle Weights and Dimensions (VWD) for Safe, Productive, and Infrastructure-Friendly (SPIF) Vehicles. The Ministry of Transportation launched the permit program in May 2018.

Smart Lift Axles (SLA) systems are a suspension technology utilized on tractor semi- and double-trailer configurations that automatically lifts one or more axles in an axle grouping when the remaining weight is within the allowable regulated axle weight limit for the remaining deployed axles. Axle weights are monitored by a load sensing control device incorporated in SLA systems.

Lifting the non-required axle(s) reduces drag, which can save fuel, and reduce emissions and wear on vehicle tires and components. SLA systems are well suited for multi-stop delivery services where weight decreases as freight is delivered, reducing the number of axles required over the duration of the trip. In addition, SLA-equipped semi-trailers do not modify or deteriorate dynamic performance and allow the vehicles to meet SPIF standards.


To apply for a permit:


By mail:

Ministry of Transportation

Permit Office

301 St. Paul Street

3rd Floor

St Catharines, Ontario L2R 7R4


By phone: 416-246-7166 or 1-800-387-7736

By fax: 905-704-2545


By email:VWD.Monitoring@ontario.ca

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