Originally Posted by sswartzl
I was surprised that in PA you can ride two abreast. Also, sidewalk riding is legal except in a business district, though pedestrians have right of way.
It's legal in most states provided that you are not impeding the flow of traffic (if riding single file would allow passing that is not possible while riding two abreast, such as in a wide outside lane on a one lane each way road, then you should ride single file).