here's the answer they gave about why the bike lanes are not protected
HPW shares your interest in making bikeways as safe and comfortable as possible. As projects move from planning through design and ultimately implementation, design standards frequently evolve, and HPW works hard to incorporate updated design standards whenever possible. Bikeway designs, in particular, have evolved substantially in Houston as national and international best practices are adopted and accepted into local design standards. In this case, this section of Shepherd/Durham was designed and budgeted several years before physically separated bikeways were common practice in Houston. Modifying the design at this point would require substantial changes to the roadway design and construction budgets and therefore cannot be accommodated at this time. Future improvements to the bikeway may be possible with a separate project.