Ontario Highway Traffic Act

I'm 35 and this is my first ticket of any kind ever. I was taking a country rd that I've never been on before because a bridge was up near niagara falls/ welland, and it was an 80km/h rd. I didn't notice that it turned into a 50 km/h after I passed over some train tracks. They were set up taking radar in some bushes pulling lots of people over. I ...