<p>basically, under normal conditions, cars will see you. the issue is, how will they react to you - it'll generally be in one of two fashions:</p>
<p>(1) You are asserting yourself as a car in the street. You occupy the center part of one lane and force the other cars to treat you as if you were a car (which you have a right to do). You signal with your hands, stop at red lights, and/or move over to let faster vehicles pass.</p>
<p>(2) You are a pedestrian, albeit one that moves faster. You stay to the extreme side of the road, and/or the sidewalks when necessary. cars will pass you and give you just enough room as they pass, but not much more. you won't get ceded a lane, just a little space. if you run red lights, from the side of the road, nobody will notice or care. (this is how delivery bikers operate)</p>
<p>other cars need to know whether to treat you as an equal or an inferior on the road. taxis will recognize and respond to both these behaviors pretty easily, although some may choose to be aggressive with you if you're acting like #2.</p>
<p>for a few years, i had a pretty poor helmet, and chose not to wear it because it obscured my peripheral vision. this was a calculated safety decision - peripheral vision is key to biking safely in new york.<br>
- I am <em>constantly</em> checking behind me to see what's going on there as well as what's in front of me, which is different than what you're taught as a driver.<br>
- you have to expect that some drivers will run red lights right as their light turns red, so always look.
- buses are easy to navigate because they're slow-moving, but they may not see you. it's a tradeoff.</p>
<p>It took me a couple years to really get used to biking in the city. It really gets the adrenaline going and is a very ADD activity - you're constantly processing a ton of inputs. (biking in the park or on the bikepath, recreationally, is much more relaxing, of course). However, with a good helmet and some common sense, it is certainly safe. I've been biking in the city 5 years now and have had one very minor accident, which was avoidable if I hadn't been so aggressive (taxi hit me doing about 3 mph in an intersection when it was unclear between the two of us who was going to go and who was going to yield). despite occasionally biking on sidewalks when necessary, i have never hit a pedestrian, but that takes very good balance and control.</p>
<p>so to sum up, it's not that big of a risk, but it takes a lot of getting used to, and may not be the kind of thing you'd want to do unless you're temperamentally suited to it. but if you are, it can save you a lot of time and money and hassle. (example: going cross-town takes forever by foot or by public transport, or costs a lot in a cab. but a bike goes crosstown really quickly)</p>