Home / Solutions / Case Studies / Tunnel / Marieholmstunneln Gothenburg, Sweden

Marieholmstunneln Gothenburg, Sweden


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  • Lamp efficacy

    Lamp efficacy

    Ensuring the lamp efficiently converts electricity into light (lm/W).

  • Ballast classification

    Ballast classification

    Controlling the electricity supply to the lamp (Energy Efficiency Index).

  • Luminaire distribution

    Luminaire distribution

    Controlling light emission using optics which bend and shape the light to the correct location.

  • System efficacy

    System efficacy

    Combining optical and thermal control within the luminaire (luminaire lm/W).

  • Presence/absence detection

    Presence/absence detection

    Presence: Lights automatically turn on/off with movement. Absence: Lights automatically turn off and must be manually switched on.

  • Daylight detection

    Daylight detection

    Artificial lighting which responds to the natural light conditions.

  • Constant illuminance

    Constant illuminance

    A function designed to produce correct light levels for the duration of the maintenance period.

  • Task-scene setting

    Task-scene setting

    Allowing the user to set scenes and adapt the lighting to different tasks.

  • Timed off

    Timed off

    Automatic cut-off can be installed to turn all lights off during unoccupied hours.

  • Task lighting

    Task lighting

    Lighting task areas with the correct amount of light.

  • Zoning of lighting

    Zoning of lighting

    Lighting is zoned according to area use.

  • Maintenance schedule

    Maintenance schedule

    Maintenance must be performed in response to product age, performance and environment.

  • Waste light

    Waste light

    Eliminating waste light which does not hit the intended target.

  • Reflectance


    Taking advantage of light which is reflected from the surface within the space.

  • Visible smart metering

    Visible smart metering

    Results of actions can be quickly seen as increased or decreased energy use to encourage responsible energy consumption.


Marieholmstunneln - the first piece in the infrastructure puzzle

The Marieholm tunnel, which forms part of the Marieholm connection, is a 500 meter long road tunnel under the Göta River that connects the E20, E6, E45 and Lundbyleden. With the Marieholm connection, the first piece of the future major traffic puzzle in Gothenburg will be laid. A series of investments in public transport, railways and roads until the year 2028 to create an attractive and sustainably growing region.

The big challenge has been to minimize the impact and at the same time build such a technically advanced project in dense traffic.

Lighting solution

In the project, we are proud to have delivered Thorn GTLED, a tunnel luminaire with advanced LED technology for very corrosive and demanding environments. Counterbeam optics are used in the tunnel's entrance and transition zones. In the inner zone, a bi-symmetrical optic is used in a linear configuration throughout the tunnel, which provides perfect smoothness.

The solution provides light levels in a range from 200 cd / m2 during the day at the entrance zone, and down to 2.5 cd / m2 at night. The lighting levels in the tunnel are adapted to the daylight conditions. Visually impaired glare (TI), an important criterion for tunnel lighting, shows an extra low value and is only 2-3% for the plant.

Fino, a linear and discreet luminaire from acdc which is easily integrated into the architecture, provides a nicely colored light.

GTLED is designed to last for many years in corrosive environments. The luminaire also has an innovative mounting system made of stainless steel. GTLED PRO is a product designed with the utmost care, with road safety in mind every step of the way.


The new tunnel lighting is very efficient, provides safe and comfortable conditions for car drivers and can be used for a long time without the need for maintenance. It is an excellent example of what can be achieved with the specialized products, solutions and subject knowledge from Thorn.

Involved in the project:
Stein Kleven, Projektansvarig Trafikverket
Gert Wingårdh, Arkitekt
David Leeb, STRABAG Infrastructure & Safety Solutions