I live along Rockville Pike and started bike commuting, just a couple of miles each way, about a month ago. I'm also branching out into errands in my area, where I can find a back way, and I've ridden into DC a few times on the CCT and/or Metro.
On the Pike and other busy roads, I usually stick to the sidewalk or else parking lots. The set speed limit is usually 30 or 35 and the cars tend to go a lot faster than that. Also, sometimes the sidewalk saves me a huge detour through a large or tricky intersection. Drivers around here are not particularly welcoming of bikes either. There's one left turn at a busy-ish intersection on my commute, and I often get grief (horns, crowding) from cars there. I dismount and walk my bike across in the crosswalk often enough, but at that intersection I usually bike (because the walk lights take SO LONG), yet I'm always wondering if I'm doing the right thing. I'm always mindful of cars coming out of driveways especially when I'm on the sidewalk, so I feel I'm choosing the safer option. The sidewalks aren't very busy here and I'm always careful to give pedestrians the right of way. For the record, cycling on the sidewalk is legal in Montgomery County.
Am I wrong to ride on the sidewalk? Am I setting back the cause of cycling? I always read that I'm not supposed to cycle on the sidewalk, but I don't see how riding in the road is supposed to work around here except on the quietest back streets. I'd like to take a class on commuting (before I bought my bike in late April I hadn't ridden in several years) but they're not offered anywhere near me. I love my new commute and I want to do it right. Thanks for your input.
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