For the past three months, Chicago has been using cameras to send warnings and tickets to drivers who have been blocking bike lanes and bus lanes downtown. Drivers could be fined up to $250.

The suburban bus agency already runs five express bus routes on the I-55 shoulder, two routes on the I-94 shoulder and six routes on I-90.

As the bus undergoes testing and prepares for public service, it paves the way for a potentially transformative shift in how we get around our cities. Would you feel comfortable riding a bus with ...