Countermobility is a military combat engineering term for actions that directly limit the mobility of the enemy. They include destroying or disabling transportation facilities such as roads, bridges and railroads; both land and naval mining; construction of military obstacles including ditches, walls, and barbed wire entanglements, etc.
In general, countermobility does not include strategic strikes on transportation systems or attack by combat arms on transportation vehicles. Bombing a concrete factory would be a strategic mission while breaking up a concrete road would be countermobility. Bombing the enemy's mobile bridges, before they are implaced, would be battlefield air interdiction, not countermobility. Destroying a dam would be countermobility if the primary intent is to drain waterways or flood land, but not if the goal were to disrupt hydroelectric power generation.