| Road Name: | Phillip Island Road |
| Road Name2: | Thompson Avenue |
| Type: | road |
| State: | vic |
| Length: | 24.9 |
| Gazetted: | September 1914 |
| Gazetted Ref: | [1] |
| Route: | B420 |
| Former: | State Route 186 |
| Coordinates A: | -38.448°N 145.239°W |
| Coordinates B: | -38.5074°N 145.4509°W |
| Pushpin Label Position A: | top |
| Pushpin Label Position B: | right |
| Alternative Location Map: | Australia Victoria Bass Coast Shire |
| Direction A: | West |
| Direction B: | East |
| End A: | The Esplanade |
| End B: | Bass Highway |
| Exits: |
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Phillip Island Road (and its northern section as Thompson Avenue) is a tourist road in Victoria, Australia, serving as the main gateway to Phillip Island, in southern Westernport Bay. It branches off Bass Highway south of the township of Bass to link with Cowes on the northern coast of the island.
Phillip Island Road commences at the intersection of The Esplanade in Cowes, on the northern coast of the island, and runs south as a two-lane, single carriageway road as Thompson Avenue as the town's main street, before reaching a roundabout with Ventor and Coews-Rhyll Road shortly afterwards, changes name to Phillip Island Road and continues in a south-easterly direction, passing a turn-off to Cape Woolamai, to the easternmost point of the island at Newhaven. It crosses Westernport Bay over Phillip Island Bridge and continues on the mainland through San Remo to eventually terminate at the interchange with Bass Highway in the south of Bass.
The passing of the Country Roads Act of 1912[2] through the Parliament of Victoria provided for the establishment of the Country Roads Board (later VicRoads) and their ability to declare Main Roads, taking responsibility for the management, construction and care of the state's major roads from local municipalities. (Main) Coast Road from San Remo to Anderson (and continuing east to Lang Lang), was declared a Main Road on 7 September 1914.[3] It was renamed Phillip Island Road at a later date.
Phillip Island Bridge, at the time a suspension bridge, was opened in November 1940, linking San Remo on the mainland to Newhaven on the island; this was replaced by a cantilever bridge in November 1969.
Philip Island Road was signed as State Route 186 between Cowes and Anderson in 1986. With Victoria's conversion to the newer alphanumeric system in the late 1990s, this was replaced by route B420. An upgrade of Bass Highway included a new link road to Phillip Island Road in 2013; the alignment of its eastern end was connected directly to Bass Highway in Bass, bypassing the town of Anderson.[4]
The passing of the Road Management Act 2004[5] granted the responsibility of overall management and development of Victoria's major arterial roads to VicRoads: in 2018, VicRoads re-declared the road as Philip Island Road (Arterial #4971) between The Esplanade in Cowes and Bass Highway in Bass.[6]
Philip Island Road is entirely contained within the Bass Coast Shire local government area.