Quote Originally Posted by Eden View Post
Careful with statements like that one... as with many traffic laws it depends totally on *where* you are. We don't have a national code for this so individual jurisdictions are free to do what they think is best. In Washington state it is entirely legal to ride two abreast. That doesn't necessarily mean we don't ever think riding single file is the sensical and do it, but being two abreast is not illegal, traffic or no traffic.
It is legal here in Colorado as well except where it impedes car traffic. So when cars are present, we are supposed to ride single file. However, for many motorists, two bicyclists riding side by side taking the entire lane seems to just aggravate them to no end. But what they do not understand is that on narrow, curvy roads, they need to be patient as the bicyclist does have a legal right to the lane. And on these types of roads the rider needs the entire lane to ride safely.

And yes, it is legal to use the entire lane on other roads as well. But it is just common courtesy to ride as far to the right as it is safe to do so to allow a car to pass safely.