What is a disadvantage of inductance loops?

Inductive loops are widely used in traffic signal systems to detect the presence of vehicles, but they do have some disadvantages. One significant drawback is that they can be damaged during pavement repairs. This occurs because the loops are embedded within the pavement itself, typically in a groove that is filled with sealant. When roadwork is being done, such as repaving or resurfacing, the removal of the existing surface can inadvertently affect the loop connections, or the loops may be cut or otherwise harmed, leading to malfunction or requiring replacement.

This concern highlights an important consideration for traffic management systems, where maintaining the integrity of detection systems is crucial for efficient operation. Other options suggest attributes that are not disadvantages at all. For instance, being immune to weather changes is a benefit rather than a drawback, while cost-effectiveness and low maintenance needs are also positive attributes in the context of inductive loops, moving them further away from the notion of being a disadvantage.