Many people drive from Arlington, Lexington, and Bedford to park at Alewife (especially in the winter). There’s no reason to believe Belmont and Waltham would be any different. The Minuteman and Mass Central/Wayside are great things. Many people do bike to Alewife and that’s great! But bike infrastructure is not enough for those towns. Arlington would be well-served by the Red Line. Extending the Red Line to Arlington Center (cut-and-cover under Minuteman, for example) would be a net positive for regional connectivity and would alleviate a bit of pressure from Alewife parking. Improving transit connection in belmont, Waltham, and Lexington would do even more to that end, especially if there was a park and ride (either Commuter Rail or Red Line) at 128 in those communities. Some people don’t, won’t, and or can’t bike 12 months a year in this region. And that’s okay.