I count how many seconds it takes for drivers to look in my direction. Sometimes they don't at all by the time I've passed in front of them. Once when that happened, they actually started to move and clipped by bike. They didn't look even once.
In the last two days, I've had two instances of drivers straight up *not seeing me.* Me, a 5'11" guy riding a 9-ft long, tomato-red cargo bike, with two kids in the bucket wearing hi-viz helmets. I'm beginning to think the "cyclist came out of nowhere" problem is on the drivers' end.