Stock Photo - Jun. 06, 1961 - INSTALLATION OF FINAL UNIT OF HAMMERSMITH FLYOVER. The erection of the main superstructure of the Hammersmith flyover - started last October - was completed today with the ceremonial placing of the last pre-cast unit. This represents 81/2 months intensive effort in erecting the 16 spans totalling 2,043 feet in length - an average of 1 span every 17 days. The flyover scheme (costing £1,300,000) is part of the Great West Road Improvement - the London section of which is costing £4,300,000. Keystone Photo Shows:- Looking beneath the flyover as traffic passes beneath the completed section - at Hammersmith Roundabout this morning. (Credit Image: © Keystone Press Agency/Keystone USA via ZUMAPRESS.com)