Professor John Parkin - Professor of Transport Engineering at the University of the West of England and Deputy Director of the Centre for Transport and Society.
Yr Athro John Parkin - Athro Peirianneg Trafnidiaeth ym Mhrifysgol Gorllewin Lloegr a Dirprwy Gyfarwyddwr y Ganolfan Drafnidiaeth a Chymdeithas (CTS).