As I retire, I want to devote my last column to travelers who wrote in to discuss their tips and travails. Some wanted to get something fixed. Some just wanted to vent. All were welcome. Dear Dr. Gridlock: I’m not a commuter, but I have a real gridlock problem. When people in a left lane don’t pull up to the vehicle in front of them, they block the ability of people trying to turn left from accessing the left-turn lane. I can’t even count how many times I’ve missed the left green arrow because of this. It seems that if...