Hmm.. I haven't encountered any gravel the last few times I went there (and I go there quite often, lol).
As for cops, I actually got pulled over on a MONDAY afternoon around 6PM (the entire area was absolutely deserted btw) by an undercover car going the opposite direction. Luckily I was just coasting at around 15over on my way back to HWY 10 and he let me go with a warning.
'12 M3 6MT Alpine White + Fox Red Extended | '09 328i 6MT Space Gray + Black