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Provincial Highway 4
Provincial Highway 4
台4線
Route information
	Maintained by Directorate General of Highways
Length	39.269 km (24.401 mi)
Major junctions
West end	Prov 15 in Dayuan
	Prov 31 in Luzhu; Nat 1 in Luzhu; Prov 1 / Cty 110 in Taoyuan District; Prov 3 in Daxi;
East end	Prov 3B in Longtan
Location
Country	Taiwan
Highway system
	Highway system in Taiwan;

Provincial Highway 4 (Chinese: 台4線) is a provincial highway that runs from Dayuan to Longtan in Taoyuan City.

Route Description

Highway 4 begins at the junction of PH 15 in Dayuan, near Taiwan Taoyuan International Airport. The highway then continues through Luzhu, and is one of the main roads in Nankan (南崁) area, one of the fastest-growing suburbs in Taoyuan City. After the intersection with Freeway 1, the road enters Central Taoyuan as Chunri Road (春日路). The road then runs concurrently with PH 1 as Sanmin Road (三民路) in downtown Taoyuan until PH 1 splits and becomes Zhonghua Road (中華路). Highway 4 continues as Sanmin Road until it reaches Bade, where it becomes Jieshou Road (介壽路) and crosses Freeway 2. The road then enters the suburban district of Daxi, where it runs concurrent with PH 3 before splitting near old town Daxi. The highway continues and ends at the north rim of Shimen Dam in Longtan.

Major intersections

County	Location	km^[2]	mi	Destinations
Dayuan	0.0	0.0	Prov 15 south (Section 3, Guoji Road) to Prov 61 – Guanyin	Access to PH 15 southbound / from PH 15 northbound only
	0.17	0.11	To Prov 15 north – Bali
	3.6	2.2	TR 5 north (Kengguo Road) – Haihu
Luzhu	5.3	3.3	TR 19 south (Bagu Road) – Dapojiao
	5.7	3.5	TR 15 south (Section 3, Fuguo Road) – Luzhu
	6.7	4.2	Prov 31 south (Nanqing Road) to Nat 2 – THSR Taoyuan Station
	8.6	5.3	TR 3 north (Section 1, Nanshan Road) – Shanjiao	No access to TR 3 from PH 4 eastbound
	8.8	5.5	TR 6 west (Section 1, Nanzhu Road) – Dazhu
	10.0	6.2	Nat 1 – Taipei, Zhongli	Exit 49 (Taoyuan Interchange) on Fwy. 1
Taoyuan District	11.5	7.1	TR 18 west (Zhuangjing Road)
	14.5	9.0	Prov 1 north (Section 2, Sanmin Road) – Guishan, Xinzhuang Cty 110 east (Chunri Road) – Central Taoyuan, Yingge	West end of PH 1 / CR 110 concurrency
	15.5	9.6	Cty 110 west (Yong'an Road) – Dayuan	East end of CR 110 concurrency
	16.0	9.9	Prov 1 south (Zhongshan Road)	East end of PH 1 concurrency
	16.4	10.2	Prov 1A (Fuxing Road)
	17.5	10.9	TR 55 south (Jiexin Street)
Bade	20.0	12.4	TR 48 west (Guangfu Road) – Zhongli
	20.1	12.5	TR 46 (Jianguo Road / Heping Road) to Nat 2 – Yingge, Xiaoli
	23.0	14.3	Cty 114 (Xingfeng Road) – Yingge, Zhongli
Daxi	25.1	15.6	TR 56 south (Lane 555, Jieshou Road)
	27.0	16.8	Prov 3 south (Section 1, Yuanlin Road) to Nat 3 / Prov 66 – Longtan	West end of PH 3 concurrency
	28.2	17.5	Prov 3 north – Central Daxi, Sanxia TR 60 north (Daying Road) to Nat 3 – Yingge TR 64 west (Sanyuan 1st Road)	East end of PH 3 concurrency
	32.8	20.4	TR 59-1 south – Cihu
Longtan	39.269	24.401	Prov 3B – Shenwo, Yuanshulin
1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus Incomplete access