I remember them being one way, but I haven't been there in a while. They're marked for the directions that are permissible; a two-way bike lane would be very wide and have a dashed yellow line down the middle.
If it's one-way, it's illegal, dangerous, and annoying to other cyclists for you to go the wrong way. You're relatively unlikely to be ticketed, but try not to ride like a ******.
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