Is this place walkable from Red Lion, i.e. are there sidewalks or a dedicated pedestrian lane?

Yes you can walk

Yes

For the most part. Plus there is not much traffic to have to worry about. It is a great restaurant!

I am not sure where the red lion is, but there are sidewalks along both roads that connect with the restaurant parking lot

Yes its about a 5 minute walk, and there's a sidewalk to it. Its also rather expensive

Yes it is 5 minute walk.

Yes there are sidewalks and traffic lights, made the same journey only a month ago!