Which type of route is marked by advisory signs for lorries?

The correct choice highlights advisory routes specifically designed for lorries. These routes often feature signs that provide guidance based on factors such as height restrictions, weight limits, and general advisories about road conditions that may not accommodate larger vehicles well.

Advisory signs are critical as they alert drivers of heavy vehicles about the best pathways to use to ensure safety and efficiency. These signs are essential for preventing potential hazards that could occur if a lorry were to utilize inappropriate or restricted routes, which could lead to accidents or traffic disruptions.

In contrast, commercial truck routes are typically official paths designated for trucks but may not have the same advisory signs tailored for lorry drivers specifically. Scenic routes focus on aesthetic value rather than operational considerations for heavy vehicles. High-speed motorways are primarily engineered for efficient vehicle flow and speed but may not include the specific advisories catered toward larger, slower-moving lorries. Understanding these differences allows drivers to navigate safely and avoid incidents on the road.