[QUOTE=MyglassISfull]
OK I take your point but cannot see your logic?
In the car you’ll be listening to the radio, possibly thinking about work or worrying about something, and be enclosed in a metal box with little exposure to the outside elements. On a bike you can feel the road a lot better, notice cross winds, hear/feel that enormous truck passing you, you can tell if the road surface is rough or greasy/damp a lot better etc etc.
[/QUOTE]
The difference is that a car provides you wit a helluva lot more protection than you get on a bike.
A few weeks ago, I very nearly pitted a bike rider who was ahead of me because he couldn’t hear a bus, nor me bellowing at the top of my lungs trying to warn him that it had come up behind him. He hit the bus (the bus tried desperately to avoid him) and a pedestrian witness came over and yelled at him for being such a dumbass.
You are much, MUCH more exposed to danger on a bike than you are surrounded by the frame of a car. You need to have all the sense you’ve got in play to stay safe, particularly if you are commuting in rush hour traffic. It is not at all the same as listening to a radio while in a car.
Do not ride in traffic with headphones.
RE: WEIGHT LIMITS:
Steel or aluminnum frames shouldn’t be an issue for you. Frames are really strong. You just have to watch your components. Some road bike tires and/or wheels have weight limits, but they come with warning stickers, and if you are a beginner it’s not likely you’ll be investing in a road bike with eensy-weensy tires like that. Some seat-posts have limits around 185-200 lbs.
Folding bikes, which are popular with commuters, aren’t as robust and can take only around 220 lbs. Some recumbent bikes take up to 300 lbs.
Steel frames have a bit more flex than aluminum frames which give you a more rigid ride. If you are exceptionally heavy (and it does not sound like you are), the less rigid steel frame will wear better, but will be a little bit more work to pedal up hills. You’d also want to avoid cheap-ass, no name bikes because their welds don’t stand up so great to abuse or bumpy roads.
Bottom line, it really shouldn’t be a problem if you have a beginner’s bike. A tall muscular rider plus paniers carrying an extra 50 lbs will be just fine and that probably exceeds your weight.