Coming from Hoover Dam or Grand Canyon West on 93, the speed drops to 35mph and is poorly marked and on a multi-lane road. Never saw a change in the speed limit. Speed limit changes probably blocked by large trucks and commercial vehicles. Pulled over west of Boulder City Dam Lodge on 93. Two of us pulled over by the same cop; at the same time, and while we were there 5 more vehicles were pulled over by 3 more police cars that stopped right in front of us. The cop laughed and said they had a zero tolerance for speeders. When I questioned the poorly marked speed limit change he stated that ignorance of the law is no excuse, but what he really meant was ignorance of speed traps is expensive. I figure in the space of 15 minutes the city collected over $2000 in fines from unsuspecting motorists. Probably not locals as they prey on tourists who probably won’t fight the ticket. Please help get the word out about Boulder City’s speed traps. Thanks