What is the maximum speed limit for trucks less than 5 tons and all passenger vehicles, including buses and motorcycles with 125 cc+ engine displacement?

The maximum speed limit for trucks less than 5 tons and all passenger vehicles, including buses and motorcycles with 125 cc or greater engine displacement, is indeed 80 km/h. This limit is designed to ensure safety on the roads and to accommodate the performance capabilities of these types of vehicles.

Many countries, including Japan, implement specific speed limits based on vehicle classifications to manage traffic flow and reduce the risk of accidents. Trucks under 5 tons, buses, and motorcycles with larger engine displacements typically have different handling and braking characteristics compared to heavier vehicles or those with much larger engine capacities. Setting the speed limit at 80 km/h balances efficiency for these vehicles while maintaining safety standards on public roads.

In contrast, other options propose speed limits that either exceed or fall below the safe operational speeds for these vehicle categories. Choosing a speed limit that is too high could compromise safety, while one that is too low might impede traffic flow unnecessarily. Therefore, the correct speed limit upholds traffic safety standards while accommodating the operational capabilities of the vehicles involved.