Richtlinien zur Ermittlung der Luftqualität an Straßen ohne oder mit lockerer Randbebauung, RLuS,  Allgemeines Rundschreiben Straßenbau, Umweltschutz, Luftreinhaltung

RLuS 3 2023                                                     

... Air pollution along streets

updated version of RLuS 2012, Fassung 2020

The Research Society for Roads and Traffic (Forschungsgesellschaft für Straßen- und Verkehrswesen e.V.) has revised the "Richtlinien zur Ermittlung der Luftqualität an Straßen ohne oder mit lockerer Randbebauung - RLuS 2012, Fassung 2020" and published them as "Richtlinien zur Ermittlung der Luftqualität an Straßen ohne oder mit lockerer Randbebauung - RLuS 2022" in consultation with the Federal Ministry of Transport and Digital Infrastructure.

In the "Allgemeines Rundschreiben Straßenbau Nr. 20/2023 - Sachgebiet 12: Umweltschutz; Sachgebiet 12.2: LuftreinhaltungAllgemeines Rundschreiben Straßenbau Nr. 03/2021 - Sachgebiet 12: Umweltschutz; Sachgebiet 12.2: Luftreinhaltung", it is recommended to use the updated programme RLuS 3 for immission assessments according to RLuS 2023.  ARS No. 03/2021 of 11 January 2021 is thus repealed.

RLuS 3 is the calculation procedure for the estimation of traffic-related pollutant immissions according to the guidelines for the determination of air quality on streets without or with loose peripheral buildings.

Model description

RLuS 3 is composed of the two programme parts emission determination and immission determination. In addition,

  • a tunnel module, which enables the calculation of immissions in the vicinity of the tunnel portal,
  • a noise protection module, which enables the calculation of immissions behind noise protection structures,
  • a intersection module, which can take into account the influences of an intersecting road, and
  • a traffic circle module that can evaluate two-, three- and four-arm traffic circles with 90° or 120° offset of the arms on the immission side,

are integrated.

The emission model has not been changed. This continues to be based on HBEFA4.1. Emissions can be calculated for the reference years 2005 to 2040. In the case of traffic-related particulate emissions, in addition to the particulates in the exhaust gas, non-engine-related particulate emissions are also to be taken into account, which are caused by road, clutch and brake lining abrasion, resuspension of dust lying on the road, etc. These emissions have been included in HBEFA since version 4.1 and are also based on it from RLuS 2012, 2020 edition. The benzo(a)pyrene emission factors, from a study by the Swiss Federal Office for the Environment, Forests and Landscape, were taken from RLuS 2012. For tunnels, separate emission factors for PM10 resuspension and abrasion were determined as part of the development of RLuS according to BASt (2013). Thus, the previous RLuS was based on findings and data with a status prior to 1999 and was implemented in the form of a set of formulas. However, advances in the modeling of flow conditions and dispersion processes led to the availability of validated operational models for immission calculations in the vicinity of tunnel portals. For the update of the tunnel module, the model system "GRAMM/GRAL" was used. In the process, the flow resistance coefficients and cross-sectional areas of passenger cars and heavy commercial vehicles, which are necessary to determine the tunnel exhaust air velocity, were also updated. Furthermore, a module for estimating the impact of traffic circles on air pollution was added to the RLuS. For this purpose, representative traffic circles were identified and extensive ride-alongs were conducted. On the basis of the collected driving profiles, emission factors for different sections of traffic circles with different maximum permissible speeds (approach, traffic circle and exit) were determined using the PHEM model of the Graz University of Technology, which is also the basis of the HBEFA. On the basis of a dispersion model, a spatially differentiated library of surcharges on the standard concentrations of a RLuS road was created to assess the immissions from traffic circles. Based on the evaluations of the rides, the entrances and exits were divided into several segments. Different emission values were assigned to each segment according to the congestion or acceleration situation. In order to be able to use the module, the RLuS calculation program was extended by a corresponding interface. This allows the immission-side evaluation of two-, three- and four-armed extra-urban traffic circles with 90° or 120° offset of the arms.

A new approach was developed for determining the reference values of the existing pollution. For this purpose, area-wide measurement data and model values for air pollution, which are determined or published by the Federal Environment Agency (UBA), were used. In order to achieve a high degree of spatial differentiation, the municipalities corresponding to the scope of the RLuS were selected as reference areas for the spatial differentiation. The base year for the determination of the reference values of the initial load is 2015. Forecasts and values for previous years were determined with the help of base data in 5-year steps and linearly interpolated for the intermediate years in each case. These background pollution values were agreed in consultation with the Air Quality/Effectiveness/Transport Committee of the German Federal/State Working Group on Air Pollution Control (LAI) and, as before, are given in tabular form in the form of pollutant load reduction factors.

Noise barriers and noise protection walls up to 10 m can be considered in the model. The estimates of the immission effects of noise barriers and noise protection walls were already quantified in RLuS 2012 on the basis of microscale model calculations (MISKAM) and compared with wind tunnel measurements and results from literature.

The simplified chemistry model based on the description of the chemical conversion in equilibrium of the substances NO2, NO and ozone is used as the NO-NO2 conversion model. The relevant influences of varying direct NO2 emissions and ozone background pollution are taken into account.

Content-related and technical explanations of the calculation procedure are contained in the Guidelines for the Determination of Air Quality on Roads without or with Loose Boundary Development (RLuS 2012, version 2020), which can be obtained from the publishing house of the Research Society for Roads and Transport (link / FGSV no.: 210 / ISBN: 978-3-86446-283-2).


New customers, single user licence PC programme RLuS 3 2023 € 238,-
Update of single user licence RLuS 2012 to RLuS 3 2023 € 193,-
Update of single user licence RLuS 2.1 (2012, version 2020) to RLuS 3 2023 € 55,-
  • The scope of delivery includes a download link for installation and a manual for each single user licence ordered.
  • The programme runs on all current WINDOWS 10 or WINDOWS 11 systems.

The purchase price includes 6 months of software support via e-mail.

We offer a telephone hotline at a price of EUR 45,- per commenced half hour.

Prices plus VAT, currently 19%

Downloads (Order form, Manual)

Download: Order form RLuS 3 2023

Download: Manual RLuS 3 2023


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