35mph speed sign barely visible and very faded on pavement when begining to enter Silverado Trail after turning right off of Hwy #121. Bike cop sits in heavy shadows of many trees especially from 11am-12noon approximately 200 yds from this intersection. Next posted 35mph sign is approximately another mile from the bike cop. He naps you before you can see a posted speed sign. I have personally watched 3 more people receive tickets for exceeding the 35mph limit. Fridays are the cops best days ticketing unaware tourists visiting the Napa Wine Country.This road is normally clear of heavy traffic and a 45mph speed limit (WITH A POSTED VISIBLE SIGN WOULD BE THE CORRECT SOLUTION FOR THIS AREA.)