# Otoyol 31

Otoyol 31, named the İzmir-Denizli Motorway (Turkish: İzmir-Denizli Otoyolu) and abbreviated as the O-31 is a 258 km (160 mi) long toll motorway in western Turkey. Beginning at an intersection with İzmir Beltway, the O-31 runs south from İzmir to Denizli and parallels the D550 and D320 for most of its route.

## Route Description
### İzmir

The O-31 begins at Işıkkent interchange, a trumpet interchange with the İzmir Beltway (O-30) in southeast Buca, İzmir, outside the urban city zone. From there, the route heads south through the recently closed Işıkkent Toll Plaza until reaching the Lesser Menderes Plain. The motorway crosses over the D.550, which is accessible via Exit K1. Exit K1, named Havalimanı, also provides access to Adnan Menderes Airport, via the D.550.
Following Exit K1 the O-31 becomes a toll motorway after passing through Pancar Toll Plaza, which uses automated vehicle classification to recognize different types of vehicles and price them accordingly.
The next and first tolled exit on the motorway is Exit K2, named Torbalı, which is the Torbalı connector. The 4 km (2.5 mi) long Torbalı connector links the O-31 to the D.550 just north of Torbalı. Following Exit K2, the motorway continues south bypassing Torbalı on the west. Near the village of Sağlık, is the Sağlık Rest Area, which consist of restaurants and a gas station. Exit K3, named Belevi, is the last exit within the İzmir province. This exit connects to the D.550 to Selçuk as well as the coastal city of Kuşadası.
After Exit K3, the O-31 passes over the 559 m (1,834 ft) long Belevi viaduct and then enters the 3,048 m (10,000 ft) long 75th Anniversary Selatin Tunnel (Turkish: 75. Yıl Selatin Tüneli), passing through the Aydın Mountains and into Aydın Province.

### Aydın

After exiting the tunnel, the Selatin Rest Area is available for northbound drivers. The motorway descends into the Greater Menderes Plain and turns east. After passing over the Kızılcapınar viaducts, Exit K4, named Germencik, connects to the D.525 to Söke, as well as the D.550 to Germencik. Following the exit, the Germencik Rest Area is available to southbound drivers. After passing over the İkizdere Creek, the tolled section ends at the Aydın West Toll Plaza.
Right after the toll plaza is Exit K5, named Aydın North, with the D.550 in west Aydın. The O-31 becomes the Aydın Beltway and runs around the south of the city. The next exit is Exit K6 with the D.550, which heads south to Muğla. Up until 2016, this was the end of the motorway. Following Exit K6, is the incomplete Exit K7. Exit K7 is where the motorway continues east to Denizli and Burdur. The O-31 used to continue as the Aydın Beltway through the next exit, Exit K71. Exit K71 connects to Mehmet Ali Tosun Boulevard and the Aydın Airport. The route continues through Aydın East Toll Plaza and restarts the tolled section. This section is operated by Fernas Otoyol İşletmesi A.Ş., under a build-operate-transfer concession. The route and tolled section terminates at Exit K16 in Kocabaş, from where it will continue towards Burdur and Antalya in the future.

## Exit list

| Province | District | km | mi | Exit | Destinations | Notes |
| İzmir | Buca | 0.0 | 0.0 | K7 | O-30 (İzmir Beltway) – Balçova, Bornova, Menemen | Trumpet interchange |
| İzmir | Menderes | 11.4 | 7.1 | K1 | D.550 – Adnan Menderes Airport, Gaziemir | |
| İzmir | Menderes | 15.3 | 9.5 | Pancar Toll Plaza | Pancar Toll Plaza | Pancar Toll Plaza |
| İzmir | Torbalı | 20.5 | 12.7 | K2 | Torbalı connector — Torbalı | Feeder to D.550 |
| İzmir | Selçuk | 34.5 | 21.4 | K3 | D.550 – Selçuk | |
| İzmir–Aydın line | Tire–Germencik line | 41.3 | 25.7 | 75th Anniversary Selatin Tunnel | 75th Anniversary Selatin Tunnel | 75th Anniversary Selatin Tunnel |
| Aydın | Germencik | 56.1 | 34.9 | K4 | D.525 – Söke D.550 – Germencik | |
| Aydın | Efeler | 88 | 55 | Aydın East Toll Plaza | Aydın East Toll Plaza | Aydın East Toll Plaza |
| Aydın | Efeler | 90 | 56 | K5 | D.550 – Aydın, İncirliova | Western end of the Aydın Beltway |
| Aydın | Efeler | 95.9 | 59.6 | K6 | D.550 – Çine, Muğla | |
| Aydın | Efeler | 97.1 | 60.3 | K7 | O-31 – Denizli, Burdur | |
| Aydın | Efeler | | | Aydın West Toll Plaza | Aydın West Toll Plaza | Aydın West Toll Plaza |
| Aydın | Köşk | | | K8 | | |
| Aydın | Yenipazar | | | K9 | | |
| Aydın | Nazilli | | | K10 | | |
| Aydın | Kuyucak | | | K11 | D.585 – , | |
| Aydın | Buharkent | | | K12 | D.320 – , | |
| Denizli | Sarayköy | | | K13 | D.320 – , | |
| Denizli | Merkezefendi | | | K14 | D.320 / D.585 | |
| Denizli | Pamukkale | | | K15 | | |
| Denizli | Honaz | | | K16 | D.320 – , | |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi Tolled Unopened |||||||