I have heard it can be tough to get birds to cross the road so good luck with that. NOT using decoys may be a good idea, based on your saying that there's lots of hens across the road. That way if Toms do come over, they may spend more time searching for the hen(s) they hear, rather than seeing decoys and holding up, waiting for the hen to come to them.
If you can get a hold of one, a gobble call (if you are NOT hunting public land) may be the way to go, idea would be to convince the other Toms that there is something worth crossing the road for.
One more suggestion would be staging a hen fight, unfortunately it requires another call or caller: basically you aggressively purr and yelp hard on two calls so you sound like two hens battling it out. I've heard the real thing and it really gets the gobblers going. It's the " a fight draws a crowd" mentality, if the birds think a fight is going on, they may run in to see what's up.
Since turkeys love to stomp on the weaker members of the flock, you might try setting up something to resemble a wounded bird. If you happen to have some turkey wings, put the hen decoy on the ground with the wings laid out so it looks like wounded. This may bring curious birds closer.
Just a few wild ideas. Good Luck!