I kinda feel like this is the lead-line for a bad kids joke - why didn't the coyote cross the road? 'Cuz there was a hunter on the other side!

So am I reading this to say that the coyotes are coming up to the far side ditch, then stopping? I've never had any trouble coaxing a coyote to "cross a road" if it was at a natural crossing point for them. If that's the case, then it might be a matter of where you're drawing the coyotes to cross. If they don't naturally cross where you're trying to call them to cross based on your calling location, they may not be uncomfortable before they get there (feeling exposed), and then if you're further asking them to crown themselves over the road, then it's simply too much to ask.

Equally, if your roadway means the edge of a boundary line between a lot of cover and NO cover, for example, wooded area and good grassland cover on their side, and wheat on your side, then the road is almost irrelevant, because you're asking a coyote to cross an "unsafe boundary" for them.

Sheridan is right, having something to entice them to naturally come across the road at a point where you want them too might help. Don't expect that they'll come feed right away at that spot, meaning to say, "don't wait for them that day," but if you bait that location consistently for a while, they'll get more bold about how they approach it.