Mississippi oversize permits are valid for three days. Must have a permit prior to entering the state.
One-half hour after sunrise to one-half hour before sunset, Monday through Saturday, with no Sunday travel allowed. In addition, 24-hour movement (including Sunday) is now being allowed for loads not exceeding 12′ wide, 13’6″ high, 99′ overall length, 150,000 pounds GVW, 4′ rear overhang. However, when the load is over 10′ wide, an escort is required for night travel.
Length: 53’0 trailer, 99′ overall length
Overhang: With up to 53′ trailer, 3′ front, 14’11″ rear
Weight: 80,000 Gross Single – 20,000 Tandem – 34,000 Tridem – 42,000
ROUTINE PERMIT LIMITS:
Height: 15’6″ (over 15’7″ requires route survey)
Height: 16’ (Over 16′ requires route survey, utility company letters, and special approval.)
Weight: Single – 20,000 Tandem – 48,000 Tridem – 57,000 (60,000 on Interstate)
Width: Over 12’11″ – 1 escort; over 16′ – 2 escorts; over 10′ wide at night – 1 escort
Length: Over 99′ – 1 escort (2 on some routes); over 105′ – 2 escorts
Height: The DOT may require an escort with high pole for some routes if conditions warrant. A route survey is required when exceeding 15’7″ in height.
Overhang: Over 15′ front or rear – 1 escort
Overweight dozer and blade must be attached, or else hauled on separate loads if blade is detached.
SIGNS, FLAGS & LIGHTS:
“Oversize Load” signs are required for all loads exceeding 12 feet wide. Flags are required on all corners of loads (mounted at a height of approximately six feet above the pavement) on loads exceeding 10 feet wide. Loads over 12′ in width require flashing amber lights mounted on the rear of the load and flags on the front corners or the load. Over-length loads and overhang in excess of 4 feet must be flagged.
Dimensions defining a “superload” vary by state (see the “Routine Permit Limits” section for states in question).
Some states take one to two weeks to approve and issue a superload permit. Expect delays.
States may require letters from the shipper, route surveys, district-by-district engineering approvals, etc. which can delay the approval process.
Measure your load carefully. An inch or two of added height can make a big difference in routing and turnaround time on a superload.