The procedure determines the average emission level of long and straight roads in accordance with RLS-90. For the calculation of Lm,E in decibels, Visum considers the following operations:
- Calculation of the average level Lm(25) using equation (7), RLS-90.
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- M = relevant hourly traffic volume (car/h)
- p = relevant HGV proportion in percent of total traffic (above 2.8 t total permissible weight)
- Determination of correction factor DStrO for different road surfaces in accordance with table 4, RLS-90. Visum keeps the correction factors listed in this table as an ASCII file RLS.DAT in the background.
- Determination of speed correction Dv for permissible maximum speeds other than 100 km/h using equation (8), RLS-90. For car v_0 is valid from 30 to130 km/h, for HGV from 30 to 80 km/h.
- Determination of correction factor DStg for inclinations and gradients using equation (9), RLS-90.
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Note: The correction factor DE which takes absorption characteristics of reflecting areas into account is not calculated. |
- The final result for every active link is the emission level Lm,E which is calculated through an addition using equation (6), RLS-90.
