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Mississippi Axle Weight Limits

Axle spacings and weight calculator

Max Legal Weight for GVW under 80,000 lbs and Max Permitted Weight for GVW over 80,000 lbs

Vehicle configuration

Maximum Legal Weight Allowed

80,000 pounds overall (GVW) and no more than 12,000 pounds on your steer. Single axle limit is 20,000 pounds, tandem axle limit is 34,000 pounds, tridem axle limit is 42,000 pounds. (The following are the Federally mandated maximum weights for the National System of Interstate and Defense Highways and reasonable access thereto (23 CFR Part 658.17) see DOC 3

Axle Group	Maximum
Single	20,000 pounds
Tandem (Two Axle)	34,000 pounds
Tridem (Three Axle)	42,000 pounds
Gross Vehicle Weight	80,000 pounds

Maximum Permit Weight Allowed

180,000 pounds maximum gross weight (daylight movement permits only);
150,000 pounds maximum gross weight (24-hour movement permits).

Maximum Axle Weights and Minimum Axle Spacings

Five Axles	(80,000 lbs to 95,000 lbs)
Steering	Spacing	Tandem	Spacing	Tandem
14,000 lbs	12’	40,500 lbs	28’	40,500 lbs

Six Axles	(80,000 lbs to 120,000 lbs)
Steering	Spacing	Tandem	Spacing	Tri-axle
14,000 lbs	12’	42,000 lbs	28’	64,000 lbs

Seven Axles	(80,000 lbs to 150,000 lbs)
Steering	Spacing	Tandem	Spacing	Quad
14,000 lbs	12'	56,000 lbs	28'	80,000 lbs
		Tri-axle		Tri-axle
14,000 lbs	12’	68,000 lbs	28’	68,000 lbs
		Tandem		Tandem	Spacing	Tandem
14,000 lbs	12’	45,333 lbs	20’	45,333 lbs	20’	45,334 lbs

Eight Axles	(80,000 lbs to 170,000 lbs)
Steering	Spacing	Tri-axle	Spacing	Quad
14,000 lbs	12’	72,000 lbs	30’	84,000 lbs
		Tandem		Tandem		Tri-axle
14,000 lbs	12’	43,000 lbs	18’	43,000 lbs	30’	70,000 lbs

Nine Axles	(80,000 lbs to 180,000 lbs)
Steering	Spacing	Tandem		Tri-axle		Tri-axle
14,000 lbs	12’	46,000 lbs	18’	60,000 lbs	30’	60,000 lbs
		Tandem		Tandem		Quad
14,000 lbs	12’	46,000 lbs	18’	46,000 lbs	30’	74,000 lbs
		Tri-axle		Tri-axle		Tandem
14,000 lbs	12’	60,000 lbs	20’	60,000 lbs	30’	46,000 lb

Superloads

190,000 pounds maximum gross weight.

Source of information:
DOC 1 http://mdot.ms.gov/documents/enforcement/Permits/Permit%20Information/Permit%20Rules.pdf
DOC 2 https://www.expresspass.ms.gov/trucking/instruct.htm
DOC 3 https://ops.fhwa.dot.gov/freight/sw/permit_report/index.htm (Federal Rules)