That snake crossing sign is about 90 minutes north of where I live. Narcisse Manitoba is reputed to be the biggest den of garter snakes in the world. They get upwards of 20000 visitors a year to watch the snakes migrate.
A few years ago Manitoba Hydro underground construction crews voluntered to push some small culverts under the highway that along with some fencing keep the snakes off the road but allow them to move to and from their dens and not get squished.
Never taken the ride up there though, the thought of that many snakes gives me the shivers even though they are safe.