What does a sign with a dotted border and the words "truck advisory 30km/h" indicate?

A sign with a dotted border and the words "truck advisory 30km/h" serves as a caution specifically meant for vehicles classified as trucks or heavy vehicles. This sign indicates that for safety reasons, these vehicles are advised to limit their speed to a maximum of 30 kilometers per hour. The advisory nature implies that while the speed limit may not be enforced as rigidly as a regulatory sign, it is a recommended limit meant to ensure safer operation in potentially hazardous conditions, such as on steep grades, curves, or in construction zones.

The choice reflects the importance of understanding road signs and the specific advisories intended for larger vehicles. The context of the warning suggests that it is aimed at enhancing safety for both the truck drivers and other road users, given the larger size and slower maneuverability of trucks compared to standard passenger vehicles.