Provincial Highway 6
台6線
Old Houwen Highway
Route information
Maintained by Directorate General of Highways
Length	31.388 km (19.504 mi)
Major junctions
North end	Prov 61 in Houlong
Major intersections	Nat 3 in Houlong Nat 1 in Gongguan
South end	Prov 3 in Wenshui, Shitan
Location
Country	Taiwan
Highway system
Highway system in Taiwan
← Prov 5 → Prov 7

Provincial Highway 6 (Chinese: 台6線) is a highway connecting Houlong, Miaoli and Dahu, Miaoli. The entire highway is within Miaoli County. The highway is now primarily used for local access after the completion of (Provincial Highway 72), an expressway running parallel to the highway.

Route description

The route is a major highway in Miaoli County, as it connects the coastal townships in Miaoli with the mountainous ones. It is also known as Old Houwen Highway (舊後汶公路) since the terminus of the highway is Houlong and Wenshui (汶水), a village in Shitan.

The highway begins at Xibin Expressway (西濱快速道路), also known as PH 61, in the coastal township of Houlong. The highway closely follows Houlong River, passing through junctions with PH 1, Freeway 3, PH 13 as it reaches Miaoli City. The highway continues to head south towards Gongguan, where it meets Freeway 1. Highway 4 reaches its terminus at an intersection with PH 3 at the border of Shitan and Dahu townships.