Work starts on Caldecott fourth tubeCaldecott tunnel is on Route 24 between Oakland and Orinda in California, US. It handles 160,000 vehicles/day through its three tubes, and is overloaded. Work is starting this month on the initial contracts of the four-year, USD420 million, 1,078 m-long fourth tube project to alleviate congestion. Some USD197.5 million of the cost is being provided the American Recovery and Reinvestment Act, making Caldecott its biggest single investment to date. For more visit www.caldecott-tunnel.org. 04/10.