Final answer:
In California, trucks may be subject to speed limits that are approximately 10 to 15 miles per hour slower than those for passenger vehicles. This is to ensure safety due to the handling characteristics of heavier vehicles.
Step-by-step explanation:
In California, speed limits for trucks can be lower than those for passenger vehicles. When considering speed limits, we must understand the difference between de jure and de facto speed limits. The de jure speed limit is the legally established limit, which you commonly see posted on road signs. Speed limits may be set lower for trucks due to a variety of reasons, including safety and the ability to control heavier vehicles at high speeds.
Though the specific amount by which the speed limit for trucks is lower was not stated in the information provided, in general, trucks may have to adhere to speed limits that are approximately 10 to 15 miles per hour slower than for passenger vehicles. This varies by interstate and local regulation. For example, if the speed limit on a certain highway is 65 miles per hour for passenger cars, it could be 55 miles per hour for trucks.
It's important to note that speedometers might not always be accurate, and sometimes a slight difference from the speed limit may be tolerated. However, consistently adhering to the speed limit, especially in a truck, is crucial for safety and avoiding traffic violations.