 By the end of that decade, a second bridge was being planned to cope with rising levels of congestion.It was constructed during 1971–72, but with only a 40-year design life as it was expected to be redundant once the planned Beechboro–Gosnells Highway (modern-day Tonkin Highway) opened.From the 1970s, Main Roads has maintained the bridges with procedures that vastly extended the bridges' lifespans, including concrete overlays on the decks, and retrofitting of steel girders.