<P> Towards the end of the 1980s scenes filmed on the exterior set became more numerous after the show's location work switched from film to videotape in 1988, although some outdoor video shooting, using large, tethered cameras, had been trialled as early as 1977 . More trials were conducted with a PSC (portable single camera) unit for the Rovers Return fire episode in 1986 . </P> <P> 1989 saw large development of the Coronation Street set . The factory and Community Centre which had occupied the site since 1971 were demolished . Three new houses, two shop units, a garage and a factory were built on the site . These developments were the idea of new executive producer David Liddiment . The tour was closed on Mondays, as this was the day that the set was used for filming at the time . </P> <P> When the Granada Studios Tour was closed in 1999 the exterior set was extended and updated . The derelict Graffiti Club on Rosamund Street was revamped and reopened as a medical centre / surgery . A new street, Victoria Street, was built to house three shops and two houses . A builders' yard backing onto the betting shop was built . To obscure one of the Granada Television buildings a new viaduct was built on Rosamund Street . This sits behind the Rovers and parallel to Coronation Street; this introduced an error, as it does not appear in the opening titles aerial shots of Coronation Street . The "viaduct" is actually a façade with an optical illusion to make it look complete . A backdrop of some Salford streets was erected in 2005 allowing shots to be filmed looking up Rosamund Street and creating the illusion of other dwellings further along that street . </P> <P> At the end of Coronation Street there is a fictitious tramline which has seen CGI trams used over it in the past (notably the opening titles and when Kelly Crabtree left the long running drama .) The storyline for December 2010 (Coronation Street's fiftieth anniversary) showed the viaduct collapse, sending the tram onto the cobbles, demolishing the Kabin and the Corner Shop in the process . </P>

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