There are several reasons. We have woefully underfunded our transportation needs as we continue to rapidly grow as a city and region. Over the next 10-30 years we have $9.5 Billion in identified mobility needs, including up to $2.3B in corridor needs. A $720M bond would make real progress and experts who have studied Austin say they are the place where we should start:

“Add capacity in critical corridors” -2015 Urban Mobility Score Card, Texas A&M Transportation Institute

“Implement corridor plans with a focus on walkability” –Jeffrey Tumlin report

“Continue working on demonstration corridors (Lamar Boulevard, Burnet Road, Riverside Drive, Airport Boulevard, and East MLK Boulevard/FM 969) to plan and build complete street improvements. These include separated bike lanes, wider sidewalks, and improved transit infrastructure with more user friendly bus shelters.” –Imagine Austin