do whatever you feel is best for you. my advice if you do ride the sidewalk, watch out for cars pulling out and DON'T ride against traffic on the sidewalk. cars pulling out will not look for you.
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"Think of bicycles as rideable art that can just about save the world". ~Grant Petersen
Cyclists fare best when they recognize that there are times when acting vehicularly is not the best practice, and are flexible enough to do what is necessary as the situation warrants.--Me