Another option would be to just pick up the animal and carry her to the other side.
The key, Julie Maguire of Turtle Rescue of Long Island tells The Dodo, is to get the turtle to the right side of the road.
"Always help a turtle cross the road by placing it on the other side of the street in the direction it was heading," she says.
But have a good look at the turtle first.
"If the turtle has a crack in the shell, do not place [him] in water," Maguire explains. "If there's a puncture in the lung, the turtle can drown, so best to just put any injured turtle found in a small box just a bit larger than the turtle, lined with paper towels or newspaper. Close the lid and keep in a quiet place until help is found."
"If a turtle is found with an injury and you can't find a rehabber to take the turtle right away, there are many vets that will treat wildlife without charge," she adds. "Just be sure to give them the location of where the turtle was found so it can be released to the same area. "
And be careful.
Snapping turtles, despite their daunting name, are especially fragile.
"In the case of snapping turtles, never, ever pick [one] up by the tail," Maguire explains. "This can break their spine causing terrible injury."
If you think the snapping turtle is injured, she adds, the best thing to do is to take him to a local wildlife rehabilitation center.