I think you need to stop somewhere on your way to work, get out, and touch the surface of the road and see what it feels like. Is it really oily? Or is it just some kind of surface treatment stuff like tar?

You're the only one here that can figure out what it is and once you do that it should be an easy call wether to ride on it or not with your bike. Remember just because it's black and starts out as a liquid, doesn't make it oil.

For an easy test though, go out to your car, reach up above the wheel into one of the wheel wells and see if there's a lot of new black tar or anything beyond the normal. Touch the treads of your tires as well (you can wipe em with a paper towel instead of your hand if you wish) If there's nothing significant then you should be fine on the bike.