Ignorance of rules seem to be part of the issue. Using bike lanes (in Cambridge!), I've had turning drivers honk or yell nasty things at intersections as I went straight through, not knowing they are required to yield. Drivers are trained to be forgiving to pedestrians and the crazy jay-walking that happens in Boston, but still treat bikes like aberrations.

I drive as well, and admit it felt very unnatural at first at check behind me for bikes when turning right.

I'm not sure there's much clear data on this. I have plenty of anecdotes from myself and other cyclists, however.

Here's what is clear: Many cyclists worry about getting rear-ended, which presumably is a major part of what bike lanes are supposed to eliminate, but those sorts of crashes are rare: http://bicyclesafe.com/#rearend2

I can recall a pro-bike-lane advocacy organization had some different data that said being rear-ended is actually common, but that seems very discordant with the remainder of the data, and they seem hardly unbiased. (The webmaster of the site I linked to seems neutral on bike lanes.)

The main risks come from intersections, and most bike lanes, even protected ones, don't address that.

My concern is that bike lanes may give inexperienced cyclists a false sense of security. These problems are relatively easily avoided if one is aware of them. See this website to learn about how to avoid the most common types of bike crashes: http://bicyclesafe.com/

As a bicyclist, I can tell you what my greatest fear is: parked cars. Statistically speaking, I am far more likely to get hurt because someone opened their driver's side door without looking than from any other cause.

As a result, when I ride by parked cars I make sure that I'm at least a car-door-length away from them when at all possible.

They're not. Protected bike lanes are for sure safer than unprotected bike lanes.

If there are problems at intersections, that means that the bike lanes aren't protected enough. Amsterdam for example doesn't have these kinds of issues because their design (and especially light signaling) is better.

> If there are problems at intersections, that means that the bike lanes aren't protected enough

Unless you design the intersections properly, then you're never going to achieve that protection. The best way to design them would be to follow how limited access highways/motorways interact with surface streets. In other words, they use interchanges.

> If there are problems at intersections, that means that the bike lanes aren't protected enough. Amsterdam for example doesn't have these kinds of issues because their design (and especially light signaling) is better.

I agree. The problem is that I have never seen those sorts of lanes in the US. The choice is between semi-protected lanes which may be worse or no lanes. I don't know precisely which is better, but I usually choose to not use the protected lanes due to issues at intersections.

We have intersections like this in NYC. Look at 8th and 9th Avenues in Chelsea for one example. There are separate phases for bikes going straight and vehicles turning left across them.

Seattle also has pretty good signage for their (very limited) protected bike lanes - typically a green-painted turning lane, with yield markings and signs. I still see drivers ignoring them from time to time - I think Mad-Eye Moody's mantra is a good one to keep in mind when riding a bike: "Constant Vigilance!".

We also have a few of these kinds of lanes in Austin. There are a few downtown and a few in East Austin.

Where specifically? I'm not aware of bike lanes that have a special light for vehicles turning across the bike lane in Austin.

I live in Cambridge and agree with the reasoning as a driver and a cyclist. They put a bike lane inside the car parking area along the main drag (Cambridge street) i live on. It’s hard as a driver to make sure the lane is clear before turning, and when cycling through you still have to be careful and look before crossing the side streets.

It’s still better and it’s been a year since I saw a bicyclist and a driver have words when the car failed to yield.