My guess is that you'd run into problems with mold or bacterial growth pretty quickly if you spread glucose syrup on roads.

Not too mention animals eating the syrup from the roads.

There is already a problem in many places with deers licking salt of the road surface.

Just add a bitter chemical, like they do with the coating of medicine so that children don't think pills are candy.

They already put corn syrup on the roads, mixed with salt.

Then we wouldn't be able to eat it off of the roads.