All oversize loads entering Charleston County, South Carolina, must conform to the requirements set by the South Carolina Department of Transportation (SCDOT).

In general, any vehicle over 12 feet in width, 14 feet in height, and within the heavy haul weight class (over 80,000 lbs) should obtain an oversize load permit from the Charleston Public Works Department.

Additionally, loads exceeding 18 feet in width, 18 feet in height, or 150 feet in length require special permits and may need additional documentation and approvals from the SCDOT and local authorities.

In Charleston, escort vehicles are required for oversize loads exceeding 16 feet in width or 14 feet 6 inches in height during daylight hours, and for all oversize loads during nighttime hours.

Local police escorts may be required for particularly large or complex loads, and can be arranged through the Charleston Police Department's Special Events Unit. Fees for police escorts vary based on the number of officers required and the duration of the escort.

To apply for an oversize load permit in Charleston, applicants can visit the Charleston Public Works Department's website or contact their Permitting Office directly at (843) 722-3775.

Applicants must provide detailed information about the load, including its dimensions, weight, and proposed route through the city. Additional documentation, such as proof of insurance and a detailed route survey, may also be required for larger or more complex loads.

Charleston has specific time-of-day restrictions for oversize loads, generally prohibiting travel during peak rush hour periods (7-9 am and 4-6 pm, Monday-Friday).

Seasonal restrictions may also apply during major events or festivals, such as the Spoleto Festival or the MOJA Arts Festival, when certain routes may be closed or restricted.

Additionally, certain neighborhoods and historic areas, such as the Historic District and areas around the Charleston City Marina, may have restricted access or require special routing to avoid disruption to local traffic and residents.

The standard permit fee for oversize loads in Charleston is $50, with additional fees based on the size and weight of the load, as well as the complexity of the route.

For example, loads exceeding 18 feet in width or 150 feet in length incur an additional $100 fee, while loads requiring police escorts are subject to the actual cost of the escort service.