National Route 173
国道173号
Route information
Length	72.4 km[1] (45.0 mi)
Existed	1963–present
Location
Country	Japan
Highway system
National highways of Japan Expressways of Japan
←National Route 172 →National Route 174

National Route 173 is anational highway ofJapan connectingIkeda, Osaka andAyabe, Kyoto in Japan, with a total length of 72.4 km (44.99 mi).

Route 173 originally ran from Osaka to Kobe. This was redesignated asRoute 43 in 1958. The current Route 173 was designated in 1963 from Ikeda to Mizhuo, replacing a section of Route 9 when it was rerouted. On 1 April 1975 Route 173 was extended over a section of Route 43 to Ayabe.

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