I'm not sure what was going on today on 287, but it looked like some quick repaving (although it appeared to be more of a black seal.) They did one lane during the day but later they directed traffic over the newly "paved" section of the road while they finished the job.
That created a mess.
It looked like people were driving on ice since the traffic was so slow. And I can't imagine how much gooey black tar was thrown all over the vehicles.