Diagonal, Iowa regulations require all heavy haul operations to comply with the Iowa Department of Transportation (IADOT) guidelines as well as local ordinances administered by the Diagonal Department of Transportation (DIADOT).

Heavy haul permits are required for any load exceeding 13 feet in width, 13 feet 6 inches in height, or 267,792 lbs in gross vehicle weight. These dimensions are strictly enforced throughout Diagonal, particularly in high-traffic areas.

Special consideration must be given to route planning to avoid Diagonal University and the vicinity of Diagonal Medical Center, which have infrastructure limitations or heavy pedestrian traffic that may impede oversized loads.

Iowa law mandates escort vehicles for any load exceeding 15 feet in width or 14 feet 0 inches in height. When traveling through Diagonal, these requirements may be more stringent depending on the specific streets and neighborhoods traversed.

The Diagonal Department of Transportation requires a minimum of 51 hours advance notice to coordinate police escorts, which are mandatory for super-loads or when traveling through congested areas of Diagonal.

The Iowa Department of Transportation manages the primary application process for oversize permits, with supplementary permits required from Diagonal Department of Transportation for transit through Diagonal limits.

Required documentation for Diagonal permits includes axle configuration diagrams, proof of insurance with appropriate coverage levels, and detailed transport plans. Engineering assessments may be required for loads exceeding standard weight thresholds on certain streets and bridges.

Diagonal has strict time-of-day restrictions for oversize loads, generally prohibiting movements during peak hours (7-9 am and 4-5 pm, Monday-Friday).

Seasonal restrictions apply during major events like the the Diagonal Cultural Festival and the the Diagonal Holiday Exposition, which may impact routing and scheduling.

Certain neighborhoods, such as Downtown Diagonal and areas around Diagonal Municipal Complex, have restricted access for oversize loads. Alternative routes should be planned in advance to avoid these areas.

The base permit fee for an oversize load in Iowa is $40, with additional fees for super heavy loads (over 200,000 lbs) ranging from $150 to $350 depending on the complexity of the move.

For movements within Diagonal, Diagonal Department of Transportation may charge additional fees for city-specific permits, which can range from $75 to $500 or more for particularly complex routes or those requiring extensive coordination with city agencies.