In 1962 the operation was renamed Driver Bus Lines and at the end of the decade Eric's two sons, Daryl and Gary, joined the business.

[2][3] In 1970, Driver Bus Lines diversified into the coach market and in January 1978 purchased the Camberwell to Box Hill service from RW Curren.

[6][7] After the Gray Line part of the business was separated, Clipper Tours was resold to Ron Deane in February 1998.

[2][8][9] Over the next decade Driver Group would gradually buy the Gray Line Australia franchises in all other capital cities.

In November 2013 the operation of Gray Line services in Sydney was sub-licensed to Australia Wide Coaches.