$10 bucks to go under the Weirs bridge - either way - keep down the congestion where there is a problem, and pay for a rent-a-cop to watch over Weirs bay.
Seriously, 90% of the lake doesn't have a problem 90% of the time. Some of the suggestions here are good, but others are pretty drastic solutions for a pretty isolated problem. Perhaps increasing the passage distance to 300 feet when going over 50 MPH would help those that fear a collision.