All we use in the fire department is incendiary, all the PA State police use are incendiary...
BUT
these things are starting to show up here and there.
http://www.powerwerx.com/product.asp?ProdID=1942&CtgID=1004&PageNo=1

and you can run over them no problem.

BUT
They are battery powered, with all the attendant issues, they are small, and close to the ground, they are directional - NOT what you want on a helicopter LZ for medevac, and, in terms of daylight visibility, they just don't compare.

I have 30-40 flares in my jeep at all times, when we have a traffic control call (wires, tree in the road) I go through dozens of them. Yes, it's expensive, but having seen them side by side, I feel safer with the incindiary types.