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I used to send possible highway route signs to the owner of The Great International Highway makeover website, Mr. R. V. Droz, a while back. Well I found out recently that his email link at his website is inoperable. Rats. I hope it'll work well in the future. 

Well, here's a sample sign:

This one is based on a concept of a "Geauxpass" toll tags only toll collection system for the Lake Pontchartrain Causeway from Metairie to Mandeville in southern Louisiana. Of course, if one crosses without the toll tag the owner of the car will receive a bill for the toll plus a nominal handling fee. But then I think the color purple should be used for all toll roads, not just the toll roads and discrete toll lanes where there are no toll takers or exact change lane machines. The type face looks kind of like Clearview but it isn't. Can you guess it? It's on UK overhead directional signs on their motorways.

And here's an enlargement of the possible route marker for the road that crosses it.It's plagiaristically based on the Quebec Autoroute route marker design. Which I think is a very nice design for non-interstate freeways, expressways and tollways in North America. Kind of classy, I think.