A similar issue to the Faerie, cropped up here in NZ, reakignment of State Highway 1, just south Auckland was held up due to fears that disturbance to a wetland would disturb a Taniwha (Maori water spirit, usually appears as a reptile but may take other forms). There was also a fear that the road would block the Taniwa's access to the nearby river. The roading company made a slight modification to the road and also put in a culvert put in a culvert so it could get under .

(They also suggested putting in a pedestrian crossing, but that may have been tongue-in-cheek, anyway we don't know if the Taniwha could work the buttons :-)

It worked out quite well, a bit of extra cost to the roading company, the local iwi (tribe) were happy and they prevented damage to what is actually a very valuable piece of wetland. Don't know what the taniwha thinks, but it hasn't eaten any cars so we figure it's probably OK :-)