A Sign That Says it All

Last year when Debsue and I were on our bike ride down the Towpath Trail, we stopped in the town of Peninsula to eat.  We discovered this sign.

In the software world, we call this a boolean expression which means it is a series of conditions all nicely laid out for us.  Let's try to break it down:

• The sign is directed at bicyclists - can't you tell by how clear the top red is?
• Only persons under 15 can ride on the sidewalk UNLESS
• Accompanying a rider under 11 WHICH
• May not ride in the street (but I guess can ride on the sidewalk) BUT
• If you see a pedestrian, you must dismount IF
• Passing said pedestrian

I guess all this is nicely laid out in the Peninsula code for those to look.  I wonder if these same people wrote the Internal Revenue Code.