The Isokylä Tunnel is situated nearby the city of Salo on the Main Road 1 between Turku and Helsinki. The tunnel is constructed as two parallel motorway tunnels of 430 m length. Each tube has two lanes.

The location close to the Baltic Sea affects the climate conditions causing occasionally dense fog. Also the specific construction of the tunnel (in east/west direction with the western part situated 15 m higher) affect the visibility in the tunnel causing sometimes strong blinding in the tunnel during evening hours because of the low orbit sun.

The Automatic Incident Detection system is used in the tunnel and its immediate surroundings, and also detects slow moving vehicles in the northern tunnel and its eastern end.

Traficon's video detection system covers the tunnel and the tunnel entrance and exit areas outside. It is composed of VIP/I boards for the detection of stopped vehicles, lost cargo, wrong-way drivers and the detection of slow moving vehicles. The VICCOM/E module communicates data, events and images over TCP/IP to the local technical room of the tunnel where Watts⁺ (software platform) is installed for monitoring the system and as database storage. An OPC interface is implemented for the Watts+ to exchange data with the Traffic Control System of the tunnel.

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