Avid bicyclists roll their eyes as state engineers rebuild a highway through town. Tyranny of the car, right? Here's a project in Utah which added a raised median that unlocked an avalanche of really cool safety improvements — including a traffic signal just for bikes!

Raised medians reduce left turns which prevents crashes (and saves lives). But cities only block left turns for some businesses and not others. How can the engineers decide fairly? And what do we do with drivers who still need to turn left...

Traffic travels in both directions. So it makes sense we’d have a malicious moniker for two-way left turn lanes (TWLTLs). Are they actually dangerous, though? Let’s look at the safety of these middle lanes. After all, they are on roads pretty much everywhere in the United...