Roads

I noticed a large RED sign today driving up 18 that read "VEHICLES BLOCKING SNOWPLOWS".
....What the hell does that mean??? Could it be a profound revealation? An opinion? A warning? A statement or a question?? Should I be on the lookout for an accident or one forthcoming? Are these signs all over the mountain? Just curious.

Using Main St. Hesperia to get home to Crestline, after you pass the Joshua Inn, the spillway and the campground, you come to a STOP sign. Looking up you can see a sign that reads "Crestline 10 miles". Turn right and continue to the next STOP at 138, turn left and continue around Silverwood. Just past the exit to Lake Silverwood there is a sign that reads "Crestline 10 miles". Huh?? Maybe the Caltrans sign guy stopped at the Joshua for a cold one that day...