|Length||33.1 km (20.6 mi)|
|From||Odawara-nishi Interchange in Odawara, Kanagawa|
|To||Atsugi Interchange in Atsugi, Kanagawa|
National Route 129
|Major cities||Hiratsuka, Isehara|
|National highways of Japan|
Expressways of Japan
Officially the road is designated as National Route 271. The entire road is built to a standard similar to that of an urban expressway and is classified as a road for motor vehicles only (���動車専用道路, Jidōsha Senyō Dōro) (motor vehicles must have a displacement of at least 125 cc).
The road connects western Kanagawa Prefecture (including the popular onsen resort town of Hakone) with Tokyo through the Tōmei Expressway. The route parallels Route 1 until Ōiso, where it then follows a northeasterly route through Hiratsuka and Isehara before terminating in Atsugi.
The road was opened in 1969 with 2 lanes. Expansion to 4 lanes was completed in 1978.
For toll collection purposes the road is divided into an Odawara section and an Atsugi section, with Ōiso Interchange as the dividing point. The toll for a normal passenger car to use one section is 350 yen.
List of interchanges and features
(all in Kanagawa)
|Odawara-nishi IC||Seishō Bypass||0.0||60 km/h||Odawara|
|Ogikubo IC||1.8||Odawara-bound exit, Atsugi-bound entrance only|
|Odawara-higashi IC||National Route 255||6.7|
|Odawara Toll Plaza/
|↓||PA: Odawara-bound only|
|17.2||PA: Atsugi-bound only||Ōiso|
|Hiratsuka Toll Gate||↓||Hiratsuka|
|Pref. Route 62 (Hiratsuka Hadano Route)||23.2||PA: Odawara-bound only|
|Isehara IC||Pref. Route 44 (Isehara Fujisawa Route)||26.8||Atsugi-bound exit, Odawara-bound entrance only||Isehara|
|Atsugi-nishi IC||Pref. Route 604 (Aikō Ishida Teishajō Sakai Route)||30.8||Atsugi|
|Atsugi IC|| Tōmei Expressway
National Route 129
|33.1||Route 129 inaccessible from Odawara|
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