Hi, rather than remove the tracktype tag here wouldn't it be better to correct it?

https://www.geograph.org.uk/photo/941370 suggests tracktype=grade4 would be more informative for routers. 

Tracks do however need specific access tagging, this is actually a byway so it is lagal to access on foot/horse/bicycle or in a car. An off-roader would certainly be interested in routing along here. Tagging as a grade4 tracktype provides information to routers not to route a road car here but a Landrover definitely.

Cheers Phil