I also stumbled upon this outlandish idea today: The Malibu-Santa Monica Causeway
It was a planned 6 mile road off shore connecting man made islands to relieve traffic on the PCH. Here's a great site that tells all about it:
http://www.surfsantamonica.com/ssm_s...in_the_Sea.htm
and another:
http://lacreekfreak.wordpress.com/20...nica-causeway/