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| direction_b = South | end_b = Yanchep Beach Road, Yanchep | through = }} Marmion Avenue is a 38 kilometre arterial road in the northern coastal suburbs of Perth, Western Australia, linking Trigg in the south with Yanchep in the north. It forms the majority of State Route 71 along with West Coast Highway, which it joins onto at its southern terminus. Its speed limit is almost exclusively 80 km/h, with only brief 70 km/h sections through the suburbs of Karrinyup and Butler. It is a four-lane dual carriageway for most of its length, but reverts to two lanes between Merriwa and Yanchep. The carriageways are divided from Merriwa, but revert to a single carriageway north of Butler. The road generally runs parallel to the Indian Ocean coastline, as well as the arterial highways Mitchell Freeway and Wanneroo Road in the east. ==History== Marmion Avenue was first built as an arterial road that tracked the then-new outer northern suburbs of Perth, following the limit of the Perth metropolitan area as it expanded northwards. In the late 1960s, the road originally began at Beach Road in Marmion, giving the road its namesake. Until the early 1980s, the road was a two-lane single carriageway connecting the coastal suburbs of Marmion and Mullaloo Beach. In 1984-85, the road was extended southwards to Karrinyup Road where it joined seamlessly onto West Coast Highway, which had been realigned further inland around the same time. Now the most important road in Perth's coastal suburbs, Marmion Avenue was duplicated up to Whitfords Avenue. In early 1986, it was assigned State Route 71, and from then on was gradually extended as a single carriageway road further north - extending first to Prendiville Avenue (just north of Ocean Reef Road), to Burns Beach Road in 1991 and to Quinns Road in the mid-1990s.. Marmion Avenue was finally duplicated to its terminus in 2001, with the last portion being the empty stretch between Burns Beach Road & Quinns Rocks. After delays due to disagreements at State Government level about what route the road should follow, Marmion Avenue was extended further north to Yanchep and opened to traffic in November 2008. The extension is currently a single carriageway, but earthworks have already been undertaken to enable conversion to dual carriageway at a later date. The extension also features roundabouts at future major junctions. The completion of this extension allowed the future satellite city of Alkimos/Eglinton to begin construction. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Marmion Avenue」の詳細全文を読む スポンサード リンク
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