The combining of the #7 Broadstreet
and #93 W. Chicago
routes created the new Route #7 Broadstreet–W. Chicago
line. Since both lines terminated in the vicinity of Grand River and Joy Road, no major route adjustments were needed to combine the two lines. The new
route would begin at Greenfield and Lyndon and operate across the Broadstreet
line via Lyndon, Livernois, Davison, Broadstreet and Joy Rd., then through-routed across the West Chicago
line via Yosemite, Ravenswood, Grand River, Jeffries Freeway Service Drive, and West Chicago to Burt Road in Rouge Park. Weekday headways averaged 30 minutes during the peak-hours and 60 minutes during the base. There was no service offered on
Sundays, with Saturday service operating only along the West Chicago portion of the route.
Of the six DSR routes combined back on June 15, 1973, the Broadstreet–W. Chicago line
would survive for the shortest period. Upon the formation of the city's Department of Transportation (DDOT) back on July 4, 1974, the two lines were separated again during the first major route changes implemented under DDOT. Route #7 Broadstreet returned again as a separate bus line, while the #93 West Chicago line was combined with that portion of the #72 Oakman line north of West Chicago. As a result, the new route #93 Chicago-Davison was launched, which would begin its first day of operations on Wednesday, September 4, 1974.
Shortly thereafter, new routes numbers were assigned to all DDOT bus routes, with the Broadstreet line becoming Route #5 Broadstreet, and the new West Chicago service
becoming Route #15 Chicago-Davison.