The traffic situation on the Douglas side of the bridge is simply and economically solved by doing one simple thing. Install a delayed traffic light similar to those used for merging onto highways found in the lower 48.
The red light/green light system with a two-, three- or four-second delay, run only during rush hour, would allow North Douglas traffic to merge safely and consistently onto the bridge. Most traffic coming from downtown Douglas must slow down near the Breeze Inn anyway because of the flashing school zone lights that obviously only run during the school year. This would prepare the traffic to stop at the delayed light, which should be installed for traffic coming and going from the island. The system works, it's far less expensive than any alternative and it is safe.