This law states that you cannot drive so slowly on a highway that you interfere with the usual flow of traffic unless it's necessary for safety, due to a steep slope, or following a legal requirement. Additionally, you shouldn't stop your vehicle on a highway if it blocks traffic unless it's necessary for safety or legally required.

The Department of Transportation can set a minimum speed limit if they find that slow speeds are consistently clogging up traffic on a part of a state highway. This limit would be marked with signs and must be followed unless it's unsafe to do so. This rule mainly applies to vehicles that need to be registered.

This law allows local authorities to adjust traffic signal timing to ensure that traffic moves smoothly and safely, even if it means cars travel at slightly different speeds than usual.

This law allows the Department of Transportation to set a safe speed limit, which can't be lower than five miles per hour, for any bridge, elevated structure, tube, or tunnel on a state highway. They can also set speed limits for other roads if requested by local county supervisors or road commissioners.

This law allows local authorities to set the maximum safe speed for specific structures like bridges, tunnels, and similar structures under their control. They can decide the speed limit themselves, as long as it's at least five miles per hour, or they can ask the Department of Transportation to determine it.

Before setting a maximum speed limit on a bridge, elevated structure, tube, or tunnel, the Department of Transportation or local authority must conduct an engineering investigation and hold a public hearing. They need to post a notice for this hearing at least five days in advance on the structure itself. After considering the investigation's findings and any public input, they will write an order establishing the safest maximum speed limit. Then, they must put up signs showing this speed limit within 500 feet of both ends of the structure or its approaches.

This law states that you must not drive over the recommended speed limit on bridges, elevated areas, tunnels, or similar structures that are part of highways, ensuring that speeds are safe for these structures. If you're taken to court for driving too fast in these areas, it can be used against you if there is proof that the Department of Transportation or local authorities have identified a safe speed and put up signs showing this limit.

This law states that certain vehicles are not allowed to drive faster than 55 miles per hour on highways. This rule applies to large trucks with three or more axles, trucks pulling other vehicles, any passenger vehicle or bus that's towing another vehicle, school buses with students, farm labor vehicles with passengers, vehicles carrying explosives, and trailer buses.

This law states that if someone driving a commercial vehicle speeds more than 15 miles per hour over the limit, it’s considered a misdemeanor. If someone with a commercial driver’s license drives a non-commercial vehicle and speeds that much, it’s an infraction. Both are deemed serious traffic violations and come with extra penalties beyond regular fines. This rule has been in effect since September 20, 2005.

If you drive a tank vehicle carrying over 500 gallons of flammable liquid and break the speed limit or drive recklessly, you face a fine of at least $500 for the first offense. If caught again within two years, you'll face at least a $2,000 fine and could lose your endorsement to transport hazardous materials for up to six months.

This law allows the Department of Transportation or local authorities to lower the speed limit for certain heavy vehicles, weighing 10,000 pounds or more, when going downhill on a highway. If they find that the standard 55 mph is too fast and unsafe, they can set a lower speed limit, choosing between 50, 45, 40, 35, 30, 25, or 20 mph. This decision is based on engineering studies and traffic surveys and is meant to keep traffic moving safely and smoothly. The new speed limit goes into effect once signs are posted on the highway.

This law states that vehicles fitted with solid tires have specific speed limits based on their total weight, including the load they're carrying. Vehicles weighing between 10,000 and 16,000 pounds must not exceed 25 mph. If the vehicle's weight is between 16,000 and 22,000 pounds, the speed limit is 15 mph. For vehicles weighing 22,000 pounds or more, the maximum speed is limited to 12 mph.

This law states that you cannot drive a vehicle with metal tires on a highway faster than six miles per hour.

In California, it's illegal to ride a motorized scooter faster than 15 miles per hour.

This law allows local authorities to lower the default speed limit of 25 miles per hour to 20 or 15 miles per hour on streets with steep grades over 10 percent, if an engineering and traffic survey shows that the lower speeds are safer. The new speed limits become official once signs are installed on the street.