Final answer:
The maximum permissible length for a straight truck is not universally standardized and varies by country and jurisdiction. It is essential to check local regulations for the correct information.
Step-by-step explanation:
The maximum permissible length for a straight truck varies by country and jurisdiction, but none of the options provided in the question, such as 12 meters, 14 meters, 16 meters, or 18 meters, are universally correct. Regulations for vehicle sizes can be found in transportation or vehicle code sections of government or state regulations. Commercial truck length regulations are created for safety and to ensure that trucks can navigate roads and highways without causing undue risk to other road users.
In some regions, for example, the maximum length might be around 12 meters (39.4 feet), but this is just an example and it is essential to check local regulations. For instance, in Europe, the limit for a single vehicle can be up to 12 meters, while in the United States, it depends on the states but can go up to 14 meters (45-48 feet) for a single straight truck.