Yes, he can get nerdier! Submit your photos of interesting infrastructure here: http://practical.engineering/whats-that-infrastructure/ Let me know what you think of this new series - What's that Infrastructure? - where we divulge and discover the man made world around us. Answers below (don't cheat!). 1. Tactile Paving (https://en.wikipedia.org/wiki/Tactile_paving) 2. Breakaway Sign Post (http://safety.fhwa.dot.gov/roadway_dept/policy_guide/road_hardware/ctrmeasures/breakaway/) 3. Bridge Protective Assembly (https://ftp.dot.state.tx.us/pub/txdot-info/brg/071813-webinar/nemec.pdf PDF WARNING!) Thanks for watching, and let me know what you think! Watch this video and the entire Practical Engineering catalog ad-free on Nebula: https://go.nebula.tv/practical-engineering Patreon: http://patreon.com/PracticalEngineering Website: http://practical.engineering/ Music: Elexive - Valley Santa (https://www.youtube.com/watch?v=TA7Hro7OYpc)