Big Rock Road is one of the main roads into/out of the newer/big residential area of Duvall… so it is highly traveled. Posted speed limit is 35, and it is on a series of hills. In places, it should be fine to go 40-45. This hill is popular because there are tons of places to hide and drivers coast on hills. Driveways, bushes, sidestreets, behind signs… be careful all along this road for at least 2 miles after you turn at the Safeway heading East. I see police hiding on this road all times of the day and even late night.