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MN Statute 169.87 allows for the following exemptions:
Subd. 7. Cargo tank vehicles.
- Weight restrictions imposed by the commissioner under subdivisions 1 and 2 do not apply to cargo tank vehicles with two or three permanent axles when delivering propane for heating or dyed fuel oil on seasonally weight-restricted roads if the vehicle is loaded at no more than 50 percent capacity of the cargo tank.
- To be exempt from weight restrictions under paragraph (a), a cargo tank vehicle used for propane must have an operating gauge on the cargo tank that shows the amount of propane as a percent of capacity of the cargo tank. Documentation of the capacity of the cargo tank must be available on the cargo tank or in the cab of the vehicle. For purposes of this subdivision, propane weighs 4.2 pounds per gallon.
- To be exempt from weight restrictions under paragraph (a), a cargo tank vehicle used for dyed fuel oil must utilize the forward two tank compartments and must carry documentation of the empty weight of the cargo tank vehicle from a certified scale in the cab of the vehicle. For purposes of this subdivision, dyed fuel oil weighs 7 pounds per gallon.
- To the extent practicable, cargo tank vehicles that are exempt from weight restrictions under paragraph (a) shall complete deliveries on seasonally weight-restricted roads by 12:00 p.m. and before the last week of April.