Hi.  I have a few questions:

I looked through this to try to figure out why a speed limit sign might be yellow.  I could not find the answer there.  Can you tell me why a speed limit sign might be yellow? 

Is there a name for a road that connects two freeways ( e.g., the 101 and 202)?

Hi, First Act!
I recently bought a very reasonably-priced children’s guitar from Wal-Mart.  I noticed that the guitar is made in China.  This concerns me somewhat after reading about Mattel’s large toy recall.  Do you know how safe the materials are that comprise these fun, educational children’s guitars?