I disagree that it's difficult: excepting toll roads and "unassumed" roads‡, the subsidy is 100% (and most toll roads are likely subsidized at a substantial fraction of their cost, since the tolls are rarely high enough to be self-sufficient).
It doesn't matter whether the money used to pay for road maintenance comes from property taxes (like in Toronto), income taxes (Ontario areas not maintained by cities / regions / counties), or gas taxes (much of the U.S.?). If you're not paying per use of the road, there is a 100% subsidy on the maintenance of the road.
There are definite costs to not maintaining those roads (people won't move where there aren't roads; unmaintained roads will result in more costs to the people using those roads as their vehicles are damaged more frequently—which may result in costs to the municipality for not properly maintaining those roads), but we should not pretend roads are self-sustaining or aren't entirely subsidized.
‡ Unassumed roads are those built privately by the landowners in common and are not maintained by the local government. When used for private dwellings, these roads usually fall under the sway of the local government after a period of time, even if they were built initially by a subdivision subcontractor.
It doesn't matter whether the money used to pay for road maintenance comes from property taxes (like in Toronto), income taxes (Ontario areas not maintained by cities / regions / counties), or gas taxes (much of the U.S.?). If you're not paying per use of the road, there is a 100% subsidy on the maintenance of the road.
There are definite costs to not maintaining those roads (people won't move where there aren't roads; unmaintained roads will result in more costs to the people using those roads as their vehicles are damaged more frequently—which may result in costs to the municipality for not properly maintaining those roads), but we should not pretend roads are self-sustaining or aren't entirely subsidized.
‡ Unassumed roads are those built privately by the landowners in common and are not maintained by the local government. When used for private dwellings, these roads usually fall under the sway of the local government after a period of time, even if they were built initially by a subdivision subcontractor.