Firth, Idaho regulations require all heavy haul operations to comply with the Idaho Department of Transportation (IDDOT) guidelines as well as local ordinances administered by the Firth Department of Transportation (FIRDOT).

Heavy haul permits are required for any load exceeding 12 feet in width, 16 feet 0 inches in height, or 274,691 lbs in gross vehicle weight. These dimensions are strictly enforced throughout Firth, particularly in high-traffic areas.

Special consideration must be given to route planning to avoid Firth Shopping District and the vicinity of the Firth Harbor, which have infrastructure limitations or heavy pedestrian traffic that may impede oversized loads.

Escort vehicles are required for oversize loads exceeding 16 feet in width or 15 feet 0 inches in height on highways and certain city streets. The Idaho State Police often require escorts for loads that are particularly large or heavy.

For movements within Firth, the Firth Department of Transportation may mandate police escorts for oversize loads, especially during peak traffic hours. Scheduling these escorts requires advance notice, typically at least 66 hours prior to the move.

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

Required documentation for Firth 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.

Firth has strict time-of-day restrictions for oversize loads, generally prohibiting movements during peak hours (7-9 am and 3-6 pm, Monday-Friday).

Seasonal restrictions apply during major events like the the Firth Holiday Marathon and the the Firth International Festival, which may impact routing and scheduling.

Certain neighborhoods, such as Firth Center and areas around the Firth Canal, 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 Idaho 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 Firth, Firth 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.