Some road tar can be surprisingly stubborn. Kerosene, WD-40, Chemical Guys Bug and Tar Remover, Meguires Bug and Tar Remover, etc. will all work but could take a long time if the tar is stubborn. Wet it with your solvent of choice, let is sit and then gently rub it off with a microfiber towel dampened with your solvent of choice. When you have it all off, there might still be tar residue embedded in the pores of the paint. It would be good to follow up with a deep cleansing paint cleaner. I used this:
and it really seemed to suck the tar stains right out of the pores of the paint. It's not a solvent, more like an art gum eraser so only use this after you have removed 99% with a solvent. If there were fine abrasives embedding in the tar, your paint probably has micro-scratches in it so you might want to use a very fine, last stage polish if the paint cleanser didn't leave the surface perfectly glossy and scratch free. The final step should be to wax the area (because the solvents will have removed all traces of the wax).
Optimum's T.A.R. is a pretty amazing product even for us professionals.
We like it because it is not a flammable solvent like most others, it's more safe on humans, and virtually impossible to damage anything on your car.