A ticket for 53 in a 50? Either you were using a GPS speedo instead of the mechanical one in the car or you were actually going faster than you thought.
Here in the UK speedometers are required to read fast and all speed cameras have 5mph dead zone to account for errors in the reading so doing 53mph on the speedo wouldn’t even set off a camera. Obviously idk about the US but it seems a bit stupid not to have a system similar to the UK one.
High pressure hydrogen is a thing too and regular petrol engines can be converted to run on it. Toyota already did it with an old corolla and a rally Yaris https://mag.toyota.co.uk/restomod-ae86/ https://mag.toyota.co.uk/hydrogen-gr-yaris-showcases-experimental-engine/ so not fully shutting the door but still a big hindrance.