Detectable warnings are not required on ramps and they are not required on curb ramps at non-signalized driveways. In this photo, what purpose do the detectable warnings serve? Are they provide to warn the pedestrian that they are about to level off?
Detectable warnings are only required within public right of ways where the pedestrian access route enters a crosswalk or other hazardous vehicular area. Non-signalized driveways are not considered hazardous vehicular areas.
See section 68.102(b)(2): http://www.license.state.tx.us/ab/abrules.htm#68102