The two roads ran parallel to each other.

extending in the same direction, equidistant at all points, and never converging or diverging.
The lines are parallel.
Keep the road parallel.
This is a parallel path.
parallel lines
parallel universe
parallel processing
aligned
side-by-side
congruent
The two roads parallel each other for miles.

To extend in the same direction, equidistant at all points, and never meeting.
Lines parallel the river.
These paths parallel the coast.
The fence will parallel the wall.
parallel each other
parallel the road
parallel the river
correspond
align
match
The new policy is a parallel to the one implemented last year.

A person or thing that is similar or analogous to another.
This is a parallel to that situation.
Find a parallel for this idea.
The story offers a parallel.
draw a parallel
a striking parallel
find a parallel
likeness
similarity
resemblance