ARFlyer
En-Route
When did highway signs stop using ' and " to indicate distance?
Over the past few months I've start to notice construction signs using F instead of '. Also underpass height signs now all read 5 F 10 IN instead of 5 ' 10".
I know in Europe signs use the letter M for distance. However, that is the correct usage to indicate meters. Unless I was taught wrong in school and by my family, using F is not the correct method of showing distance.
Over the past few months I've start to notice construction signs using F instead of '. Also underpass height signs now all read 5 F 10 IN instead of 5 ' 10".
I know in Europe signs use the letter M for distance. However, that is the correct usage to indicate meters. Unless I was taught wrong in school and by my family, using F is not the correct method of showing distance.


. Plus there are plenty of zones that are 30, 35, 40, 45, plus a lot of highway that is 65 mph etc. so it's not like there is a default speed that is knowable once you pass one of those signs. Still seems weird to me. 