The bridge might be illogical, but it’s about time people learn which lane to drive in depending on their destination.
The traffic jam is all caused by people heading to Sin El Fil and insist to drive on the left side of the road until the last few meters before reaching the bridge located on the right side. That of course forces them to suddenly slow down and make a right turn to take the bridge, causing everyone behind them to slow down as well.
Keep left if you’re going to Beirut, and right when going to Sin El Fil! Easy!
Update:
Here’s the Facebook page of the people behind that sign.
Thank you @Marilynzakhour