I have a narrow road on my commute through an urban city section, which is perpendicular to some one way streets. I typically take the lane on this road, but there is one tricky section. If I take the middle of the lane, I have to be careful at the stoplight because the cars making a left turn (from the one way road) often make wide turns that cause them to cross into the lane where I am stopped. To avoid this, I would position myself a bit right of center. However, there are also people behind me that need to take a right onto the one way road . If I position my bike far enough left to allow the people to pull to my right to turn right, then I am in the "risk zone" for the people making a wide left turn from the one way street...

Another risky place for taking the lane is on windy country roads with no bike lane that are popular "scenic routes" with drivers and cyclists. I will take the lane when going downhill at the speed of traffic on these roads, but there is a particular risk... Due to all the cyclists going uphill (without a bike lane), the cars on the uphill side will pass them, often crossing way over into the lane of oncoming traffic to pass the uphill cyclists. If a downhill cyclist is the "oncoming traffic," there is risk that the car passing the uphill cyclists could veer out into oncoming traffic and hit the downhill cyclist traveling at the speed of cars.