Highway 12, approx. 5 mi. EAST of COPELAND RD. (Central Park area)  needs a solution to the congestion during busy times. There are more than 35 driveways/intesections in approx. 3 miles WESTBOUND from Bryrwood Dr,. & EVERY summer weekend it is impossible to merge onto the highway SAFELY. If there were signs at both ends of Central Park, westbound & eastbound, saying "Thru Traffic Keep Left Next 4 Miles" it would certainly help.  For Central Park residents it is a very frustrating problem because even if the inside lane has lots of space, many people in the outside lane don't move over, and at times we are forced to pull out where there's not much room. With tremendously more traffic in the last twenty years, the traffic Fridays/Saturdays heading westbound to the beaches & back eastbound on Sundays is horrendous. Its a wonder there haven't been more severe, multiplle vehicle accidents, but it's only a matter of time.  Please consider installing such a sign to alleviate this problem.