Idaho Oversize Load Signs, Flags And Lights

What Idaho Sign Size Is In The Current Rule?

Section 104.05 requires signs on vehicles/loads exceeding legal width. The minimum panel is 5 feet by 12 inches with 8-inch black letters, a 1-inch stroke and yellow background. It is displayed on the towing vehicle’s front or roof and the load’s rear; self-propelled oversize vehicles use front/back or roof. Empty legal-dimension vehicles do not display signs.

Older reference material may cite a different section number and larger panel. Compare the edition and section before treating those older measurements as the current minimum. A larger sign still needs a mounting arrangement that leaves required lighting and the driver’s view clear.

How Does Idaho Treat Rear Overhang Flags?

Section 104.04 requires red or fluorescent orange flags at least 18 inches square for overwidth vehicles/loads and rear overhang 4 feet or more beyond the trailer. For the rear overhang, one flag marks a portion no more than 2 feet wide; two indicate a wider portion.

Start the rear measurement from the trailer end, as specified by this rule, rather than casually substituting a different reference point from another state. Identify whether the projecting portion widens at its tip before choosing one or two mounts.

When Must Idaho Load Extremity Lights Be Reviewed?

Section 104.02 addresses overwidth movement from 30 minutes after sunset to 30 minutes before sunrise, or visibility below 500 feet. Additional extremity lamps are amber toward the front/middle and red toward the rear. Section 104.03 separately describes rear-overhang lights at 4 feet or more.

A daytime rain or fog event can therefore raise an equipment question even before the clock reaches the nighttime period. Equipment requirements do not establish that continued movement is safe or authorized; resolve the permit’s travel restrictions as well.

What Is Separate On An Idaho Escort?

Section 306 specifies a rooftop OVERSIZE LOAD sign, warning lights above the roofline and headlights/taillights during escort movement. Signs are not displayed when the vehicle is not actually escorting.

Inspect the light arrangement with the sign raised. Make the transition out of escort service part of the agreed handoff rather than expecting the following driver to notice that the pilot has finished. Keep the truck and escort checklists side by side so equipment is not credited to the wrong vehicle.

How Can RouteAll Help With This Movement?

Review the Idaho permit’s road sequence in RouteAll and check the extraction against the issued document. Keep the current equipment rule and any special permit condition accessible to the crew. RouteAll does not measure rear projection, inspect the sign or determine whether reduced-visibility movement is authorized. Get RouteAll For Permit Route Review.

Before You Roll

Use Section 104’s current numbering, measure the trailer-relative rear projection and check the full loaded outline. Inspect lights when the low-visibility provision applies. Complete the escort’s independent equipment list rather than crediting the truck’s sign to both vehicles.