Restriction of heavy duty commercial vehicles
Detailed description of the Good Practice
Two major roads pass through the inner city of Hagen bringing high traffic volumes and transit traffic in this densely populated part of the city. To reduce air pollution, 3 clean air plans and an action plan were finalised in 2004, 2005 and 2008. Since heavy duty commercial vehicles emit a disproportionately large amount of air pollutants, the clean air planning focuses in particular on these road users. As part of the clean air planning two different schemes for air pollution dependent road blocks in different parts of the inner city have been developed
Objectives of the Good Practice
to reduce air pollution
Participants of the Good Practice
City of Hagen
Funding of the Good Practice
City of Hagen
More Details of the Good Practice
The air quality depending dynamic traffic management restricts access for lorries >3,5t (except of residents and their delivery) if air quality related NO2-thresholds are exceeded. It can be imposed and abolished continuously depending on air quality and meteorological conditions. Test operation started in spring 2007; in autumn 2009 the last configuration level shall be implemented. This concept was developed with support of the German federal state environment agency.
The transient lorry driving ban blocks the Graf von Galen Ring for lorries >3,5t. It will be put into force (with a traffic sign that can be opened manually) if the daily threshold for PM10 concentrations has been exceeded for more than 35 times / year and additional exceeding is to be expected. After being imposed, the driving ban is sustained until the end of the year. Resident traffic is not affected.
Both concepts can in particular reduce peak concentrations. Strict control is necessary to ensure the effectiveness of the measures. To reduce the relocation of emissions due to the small scale dynamic blocking, the voluntary routes of the lorry route concept become mandatory when the driving ban is active thus reducing lorry traffic in the entire inner city.
The test operation of the dynamic air quality depending traffic management has shown its usability to reduce NOx emissions. Model calculations based on 2 test operations showed 14% resp. 20% reduction of emissions (less disobeying in the second test operation). In addition, this concept, aiming at NO2 was able to reduce PM10 emissions as well. Model calculations showed 11% respectively 16% reduction based on the 2 test operations.
The lorry route concept in combination with air quality depending dynamic traffic management are expected to reduce PM10 by 1 µg/m3 and NO2 by 10 - 20%.
Data sources and references
European Local Transport Information Center
http://www.eltis.org/study_sheet.phtml?study_id=2171&lang1=en (Accessed December 30, 2009)