Response provided by Richard Reynosa, Assistant Director of Engineering/CIP:
Protected Bike Lane: A protected bicycle lane can be one or two-way within the roadway, and is separated from automobile traffic by a physical barrier. Protected bike lane is appropriate for facilities with speeds 35 mph or more; may be considered at lower speeds. Protected bike lane is also recommended for roads with more than 5,000 vehicles per day with high truck traffic and on-street parking.
Example: Guadalupe St Cycle Track; Hunter Rd Bike Lane
Buffered Bike Lane: Buffered bicycle lanes are on-street lanes with a wider, painted striped buffer to separate it from automobile traffic. Buffered bike lane is appropriate for facilities with speeds 35 mph or more; may be considered at lower speeds. Buffered bike lane is also recommended for roads with more than 5,000 vehicles per day and with high truck traffic.
Example: Cheatham St Bike Lane