Quite frequently I see the two terms used interchangeably. I think there is a difference.
A road map is not a plan. To use a software term: A road map is just a data structure.
To get from city A to city B by road, one consults a map to decide on means of transportation; the route to take; contingency routes; what are the other cities on the way; road conditions; refuelling stops; weather conditions; ... That does not make it a travel plan. It is when we plug in estimates of dates and estimates of travel time and estimates of stop times, and decide on preparatory measures that it becomes a travel plan.
Different travellers can have the same road map for getting from city A to city B. Yet they may have different travel plans.
A Project Roadmap just has a set of paths to desired project outcomes. It is estimates of time, and allocation of resources, that create a Project Plan.
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