I think we've discussed this before but we need to really stop building transit lines on freeways. I'm not talking about allowing buses to use the HOV lanes but rather building new light and heavy rail lines along the side or in the center of freeways. If we want to create the most value out of these investments, existing ROW needs to be thoroughly examined for its benefits, which includes existing freight ROW as well.
The South Corridor in Charlotte is a good example of using the existing ROW because it runs a close parallel to the main south arterial street. However lines such as the Baltimore light rail line are really poor applications of existing ROW. The line there completely misses the downtown of Towson which is a major regional destination. BART is a huge example of rail transit designed for the auto age. Why didn't they run the Pittsburgh BayPoint Line under Broadway in Oakland instead of along the freeway median to Rockridge?
I think we need to think about how we can move away from focusing solely on the Interstate system that is built out as well as believing that since the interstates are there, they are the best routes for transit. They are the worst routes for Urbanism as freeways are not urban.