You know how the modern-day traffic light works, don’t you? Red means Stop, Green means Go, and Yellow means Slow Down. But do we need a White light? Experts argue that adding a fourth light would shorten wait times at street corners for pedestrians, while also improving traffic flow. Do we need it? CTV’s Dan Riskin weighs the pros and cons in Hour 4. Plus, a Liberal MP has been voicing his frustrations over a recent House of Commons vote, and he might be willing to join the Blue Team because of it.