What is a disadvantage of using satellite navigation systems?

Using satellite navigation systems indeed presents the disadvantage of not being aware of weight restrictions along routes. While these systems are powerful tools for navigation, they often rely on databases that may not include every local regulation, such as height and weight limits on roads, bridges, or tunnels. This lack of awareness can pose significant risks, especially for emergency vehicles and larger trucks that must adhere to specific transport regulations.

In contrast, the other options highlight beneficial features of satellite navigation systems, such as providing real-time traffic updates and being able to suggest routes that are more fuel-efficient or possibly faster. However, these advantages do not mitigate the critical omission regarding weight restrictions, which can have serious implications for safety and compliance with road laws.