Should cyclists stop at red lights? Why do we feel such a strong urge to keep rolling? Should our behavior be guided by the law of the land or the laws of common courtesy? What would Isaac Newton and Thomas Aquinas have to say about the matter? Bringing their expertise to a discussion of the physics and philosophy of cyclists and red lights are Nigel Warburton of the Open University, the popular Philosophy Bites podcast and author of several classic textbooks on philosophy and Mark Miodownik, head of the Materials Research Group at King’s College London and writer and broadcaster.