Brief description

Attica Tollway is a pioneering project constructed on a concession basis and constitutes one of the biggest co-financed road projects in Europe. It belongs to the first generation of co-financed projects awarded in Greece during the '90s and, essentially, paved the way and laid the foundations for the execution of future successful concession contracts, in Greece and in other European countries.

Attica Tollway is a modern motorway extending along 70 km. It constitutes the ring road of the greater metropolitan area of Athens and the backbone of the road network of the whole Attica prefecture. It is an urban motorway, with two separate directional carriageways, each consisting of 3 lanes and an emergency lane (hard shoulder). The suburban railway of Athens has been constructed in the central reservation of the motorway. Attica Tollway constitutes a unique piece of infrastructure, even in European terms, since it is essentially a closed toll motorway, within a metropolitan capital, where the problem of traffic congestion is acute.

Attica Tollway is part of the PATHE road axis (Patra - Athens - Thessaloniki - Evzoni) and connects the Athens - Lamia National Road with the Athens - Κorinthοs National Road, by-passing the centre of Athens. Being a closed motorway, it has controlled access points and consists of two sections, which are perpendicular to one another:

  • The Elefsina - Stavros - Spata A/P motorway (ESSM), extending along approximately 52 km, and
  • The Imittos Western Peripheral Motorway (IWPM), extending along approximately 13 km.

There are several significant benefits resulting from Attica Tollway, as the motorway:

  • Forms the main backbone that links all the modes of transportation and infrastructures in the Attica region: i.e. road, air, rail and sea;
  • Significantly improves traffic conditions within the capital, by absorbing a significant portion of the daily traffic moving across the Attica basin;
  • Contributes to urban development and completion of physical planning in the Attica prefecture;
  • Promotes the strategic restructuring of the energy and telecommunication networks;
  • Contributes to the residential and business development of the remote areas of Attica.

General and technical characteristics of the project

Project features
  • Total length 70 km
  • Service / side road network 150 km
  • Interchanges 29
  • Motorway Overpasses 100
  • Motorway Underpasses 25
  • Rail bridges 38
  • River/Stream bridges 21
  • Pedestrian Overpasses 12
  • Tunnel/Cut & Cover Sections 56
  • Total length of Tunnel/Cut & Cover Sections 15,36 km
  • Flood protection works 66,70 km
  • Motorist Service Stations  (M.S.S.) 4
  • Operation & Maintenance Centre 1
  • Subscribers’ Service Points 11
  • Toll Stations 39
  • Total number of toll lanes 195
  • Electronic Toll Collection (E.T.C.) lanes94
  • Manual Toll Collection (M.T.C.) lanes 156

Innovations in construction and operation

Innovations in Construction

Modern innovative methods have been used in the construction of Attica Tollway:

  • Open-cast mining excavations

    Special vibration recording instruments (vibration recorders) were installed and special methods, where applicable, were used to restrict peak particle velocity to below 6 mm/sec (P.P.V) in residential districts.

  • Tunnel construction

    In addition to the ΝΑΤΜ (Drill & Blast) method, the tunnel construction method using Roadheader machinery was also applied to reduce vibrations (the peak particle velocity was limited to 0.7 mm/sec) and to avoid using explosives in areas of historical interest (monuments, churches etc.)

  • Bridge construction

    In addition to the usual methods of on-site concreting of conventional or pre-tensioned girders, the Incremental Launching System has also been used for constructing the superstructure of bridges.

  • Flood Protection

    Attica Tollway passes through the three large hydrographic basins of Attica (Thriasio Pedio, Athens basin and Mesogeia) and interrupts the surface runoff coming from the Parnitha, Penteli and Imittos mountains to the sea. The morphology of the aforementioned areas, now featuring minimum natural receptors, the exponential expansion of the land use and the various types of human interventions have rendered the construction of substantial extensive flood protection works within the scope of the Attica Tollway implementation imperative. The flood protection works constructed have been dimensioned so that they are adequate not only for the existing land use (pastureland in the Thriasio Pedio and agricultural cultivation in the Mesogeia area) but also for the reasonably expected changes in the land use, which exponentially aggravate drainage conditions and are the most serious cause of the flooding problem within the Attica region.

  • Rainwater / Sewage Disposal

    Special equipment has been used for the underground routing of rain water / sewage disposal pipes using the Ρipe-jacking method. Drain pipe impermeability has been controlled using the soil mechanics air pressure balloon method.

  • Road Pavement

    For the first time, road pavement has been constructed using the latest construction methods and mechanical equipment, reliable materials and specialized laboratory measurements and tests to ensure durability over time.

Operational Innovations

Administration and management mechanisms, supported by the design and development of new organizational structures and processes, as well as innovative management tools, making wide use of new software programmes, have been developed for managing Attica Tollway. The following systems are used to ensure the best possible operation and maintenance of the motorway:

  • High technology systems for monitoring the smooth flow of vehicles and identifying possible incidents, always with a focus on user safety.
  • Electronic toll collection system, as well as subscription programmes, for best customer service.
  • Installation of noise and air pollutant level measurement stations, with special emphasis on monitoring exhaust fumes inside tunnels.
  • Special noise barriers made from various materials with high quality and aesthetic design (e.g. glass, metal, polycarbonate, bois beton etc.) to reduce noise pollution.
  • Application of anti-graffiti coating on the exposed concrete surfaces.