The concept is good – If you can use any combination of transit-walking to get where you need, you can get rid of that car. The transit information (at least for my area) needs major updating. Also , mapping for comparative purposes needs to be based on something else than zip codes . Given the mess that urban development was in US, my mailing address locates me in the “city” whilst my physical address is in a suburban area. For a suburban area I know I should have a better transit score compared with other suburbs , but it will definitely poorer if the scored compared with the 'city' …