A4milano Est - Bergamo
construction of lane 4 (34 Km)
The work involved expanding the 33.6 km of A4 highway between Milano Est and Bergamo from three to four lanes plus hard shoulder to improve the traffic flow and safety of the stretch, which is used by an extremely high volume of traffic, with peak traffic of approximately 176,000 vehicles per day with approximately 50,000 lorries and buses.
As scheduled, the intervention was completed in just two years, thanks to the constant work of the subsidiaries Spea and Pavimental, and to collaboration with the Lombardy Region and local authorities.
Additional interventions were also undertaken, such as:
- the transfer and upgrading of Trezzo junction, on which work was completed on 6 October 2006, and upgrading of 4 existing junctions
- 450 aqueduct, gas pipeline and power line relocation interventions the demolition and refurbishment of 39 flyovers, with work being carried out during days and times of reduced traffic
- expansion of the bridges over the River Adda and River Brembo
- construction of 2 new steel bridges over the Treviglio-Bergamo railway line, in collaboration with RFI
- installation of 29 km of noise barriers
The work was extremely challenging on account of the small work sites available in this highly developed area and the need to guarantee motorists use of the same 3 lanes as before the commencement of works.
Autostrade per l'Italia has fully funded and is in the process of constructing a series of local interventions:
- expansion of local roads
- addition of roundabouts and cycle paths
- construction of park and rides to integrate the highway with the external road network.
|WORK PROGRESS||OPENING TO TRAFFIC|
|WORK COMPLETED (*)||SEPTEMER 2007|
1Partial openings were envisaged between December 2006 and July 2007 for a total of approximately 27 km. Work is currently in progress and ancillary off-highway works are also underway.
One year after it was opened to traffic, lane 4 of the Milano-Bergamo stretch has already recorded a significant decrease in travel times, in the accident and in air and noise pollution. The main results achieved are set out below.
- TOTAL TIME LOST(1): -84,5%
- "BLOCKED TRAFFIC" HOURS: -79,3%
- OVERALL ACCIDENT RATE: -45,5%
- MORTALITY RATE: -36,1%
- CO (CARBON MONOXIDE) EMISSIONS: -35%(2)
- NOx (NITROGEN OXIDE) EMISSIONS: -13%(2)
- VOC (VOLATILE ORGANIC COMPOUND) EMISSIONS: -14%(2)
- PM10 (FINE DUST) EMISSIONS: -22%(2)
- noise pollution: -100%(3)
|1||Total Delay: difference between the average travel time detected on a stretch in the period in question, and the average length of time spent in free flow conditions at the average typical speed for this stretch multiplied by the number of vehicles.|
|3||Reduction of sound levels by 4 dB(A) on sensitive receptors.|