A safer golden gate bridge


One of the world's most photographed - and busiest - bridges is moving traffic faster and more safely than ever before.

In early 2015, The Road Zipper System® was installed on San Francisco's iconic Golden Gate Bridge. This system consists of moveable barriers and a Road Zipper machine, replacing plastic tubes that previously separated outbound and inbound traffic which were unable to prevent crossover crashes in the event a driver lost vehicle control.

Previously the bridge carried three lanes of traffic in either direction. The use of the new machine means that the bridge retains six lanes in all, but can be reconfigured to feature up to four lanes in one direction and two lanes in the other, to better cope with daily commuter traffic needs - now and in the future.

Lindsay Transportation Solutions partnered with the Golden Gate Bridge, Highway & Transportation District to engineer this streamlined version of the Road Zipper machine, which was custom-made in Rio Vista, California and Lindsay, Nebraska to fit the Golden Gate Bridge’s narrow lanes.

The Road Zipper System is one of the few options on the market that provides superior flexibility. For example, by planning to include just one extra meter of lane/shoulder width in the bridge design phase accommodates for future increases in traffic capacity.

The advantages of future flexibility

See how the Road Zipper System is a proactive (not reactive) approach to future needs.

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  • The bridge currently carries average traffic on I-101 of 110,000 vehicles/day, with that volume projected to rise to 138,000 vehicles/day by 2038
  • 11,500 feet of barrier consist of 12-inch wide x 32 inch high steel-clad units filled with high-density concrete
  • In one pass, the barrier is transferred 11 feet and gently set down without damaging the road at speeds up to 10 mph
  • Barriers can withstand the force of a 4,400-pound truck traveling at 62 miles per hour, virtually eliminating crossover collisions