For a California flatbed, the mountains can close the route. Caltrans and the CHP note that I-5 fully closes for snow and ice an average of three to five times between October and April, and estimated reopening times for the Grapevine are not forecast. Chain controls add another layer, with separate MIN and MAX rules for trucks, and open-deck loads sit exposed while you wait. Ask how your cargo policy handles weather damage and delay. Truck and trailer combinations are limited to 55 mph and must stay in designated lanes or the right-hand lane, which affects delivery windows. The Motor Carrier Permit, MC 65 M and $750,000 are the baseline, and CHP can inspect your terminal under its inspection program.
Flatbeds and step decks haul open-deck freight: steel, lumber, pipe, machinery and building materials. The driver secures every load under the federal cargo securement rules in 49 CFR Part 393, and weather reaches the freight directly. Loading and tarping also put drivers at height, which is why injury coverage deserves as much attention as the truck.
What it costs
Across 18 policies Protec sold in 2026, commercial auto liability for this type of truck ran about $14,100 to $20,200 per truck per year, with a middle of $16,000. That's before taxes and fees, mostly from new and small Texas carriers, so your state and record can move it. It isn't a quote.
Filings in California
Running in California? You need a Motor Carrier Permit (MCP) from the California DMV. For-hire carriers need it for any motor vehicle, regardless of type or size, according to the CHP. Private carriers generally need it for a truck of two or more axles rated over 10,000 pounds GVWR, truck tractors, and certain other vehicles. Before the permit, you get a CA number from the California Highway Patrol (CHP) by filing a Motor Carrier Profile (CHP 362).
Minimum liability (combined single limit): $300,000 for non-hazardous property in vehicles of 10,000 pounds GVWR or less, and $750,000 for vehicles of 10,001 pounds or more. Hazmat requires $1,000,000 to $5,000,000.
Filings: your insurance company provides the Certificate of Insurance (MC 65 M). You also prove workers' compensation or sign an exemption statement, even if you employ only family. DMV may suspend the MCP if liability or workers' comp lapses.
If you cross state lines, the federal rules apply. A for-hire carrier of general freight in interstate commerce with vehicles of 10,001 pounds GVWR or more needs at least $750,000 under 49 CFR 387.9. The policy carries the MCS-90 endorsement, and your insurance company, not you, files the BMC-91 or BMC-91X with FMCSA. Hazmat limits run higher.
The limit is the same $750,000 for most heavier trucks, but the BMC-91 goes to FMCSA and does not replace the MC 65 M filing with DMV.
Coverages to ask about
- Primary auto liability
- Motor truck cargo, checked against the commodities you haul
- Physical damage on the tractor and trailer
- Occupational accident or workers' compensation
- General liability, when a shipper requires it
- Non-trucking liability, for leased owner-operators
What underwriters look at
- Commodities, especially steel coils, machinery and oversize loads
- Securement experience and driver training
- Any oversize or overweight permit work
- Radius and states of operation
- Cargo limits and any policy exclusions
- Driver records and loss runs
Other trucks in California
- Dump truck insurance in California
- Dry van insurance in California
- Hot shot insurance in California
- Box truck insurance in California
Free FMCSA check · New authority checklist
Protec Consulting Group is a licensed insurance agency in California.
Sources: California DMV, Motor Carrier Permits · California DMV, Motor Carrier Permit FAQs · California DMV, MC 706 M Application Instructions · CHP, Motor Carrier of Property Permit FAQ (rev. 8-23) · CARB, Clean Truck Check Overview Fact Sheet · CARB, Truck and Bus Regulation · CARB, Advanced Clean Fleets amendments (news release, September 25, 2025) · 49 CFR 387.9, schedule of limits (Cornell LII) · 49 CFR 390.5, definition of interstate commerce (Cornell LII) · FMCSA, Insurance Filing Requirements · USGS, Mineral Commodity Summaries 2026, Sand and Gravel (Construction) · Caltrans, Truck Lane Use (Vehicle Code 22406) · Caltrans, Chain Controls · Caltrans and CHP, Operation Snowflake flyer · Port of Los Angeles, Facts and Figures · Port of Los Angeles, Clean Truck Program · CDFA, California Agricultural Production Statistics. Reviewed: 2026-11-03.