the tagging of toll=yes|no appears consistent to what's said here though looks confusing indeed.  Currently the junction of the ramp from research to the toll road is where the toll ends so routers should know that there is no toll from research sb to sb us183.  where is the last toll booth for SB 183a toll road, perhaps all of the road from the last toll booth  should be marked toll=no alas the current mapping looks ok imho.