Does this mean that the road leading away from the stop is long, or that the road is a long way from the stop?
The road leading away from the stop.
The other way, the road being a long way from the stop would be "A megállótól messze van az út."
In this sentence could 'út' mean journey or way? As in 'it is a long way from the stop to your destination'?
In one other example session, you used “station” for the word megalló, rather than “stop”