Road Indicators

GeoClimate offers a processing chain to compute road traffic indicators based on the table Tool 2.5 (WG-AEN method) described in the Good Practice Guide for Strategic Noise Mapping and the Production of Associated Data on Noise Exposure Version 2 (13th January 2006).

The chain uses the GeoClimate road layer and a configuration file that contains information to establish relations between the WG-AEN referential and the road layer features:

  • a mapping from WG-AEN road types to the road layer types (WG type)

  • the CNOSSOS-EU pavement codes according to the surface values available in the road layer (WG pavement)

  • the Tool 2.5 flow data by WG-AEN road types for the 3 periods: day, night, and evening (WG data flow)

  • the maximum speed value according to the WG-AEN road types (WG maxspeed)

_images/geoclimate_processing_road_traffic.png

Figure 3. Processing steps to compute a road traffic flow based on WG-AEN referential

For each road geometry, the road layer generic fields type, surface, oneway, and maxspeed are mapped to the WG type, pavement, and direction as defined in the WG-AEN referential. These values are then intersected with the WG data flow to compute the number of light and heavy vehicles per hour for the 3 time periods:

  • Day (06:00–18:00)

  • Evening (ev) (18:00–22:00)

  • Night (22:00–06:00)

The 16 resulting indicators are stored in the road_indicators table:

  • The WG-AEN road type

  • The pavement code

  • The direction of the road section:

    • 1 = one-way road section, traffic flows in the same direction as the slope definition

    • 2 = one-way road section, traffic flows in the opposite direction to the slope definition

    • 3 = bidirectional traffic flow (split between uphill and downhill)

  • The number of light vehicles per hour for day

  • The number of heavy vehicles per hour for day

  • The light vehicle speed for day

  • The heavy vehicle speed for day

  • The number of light vehicles per hour for night

  • The number of heavy vehicles per hour for night

  • The light vehicle speed for night

  • The heavy vehicle speed for night

  • The number of light vehicles per hour for evening

  • The number of heavy vehicles per hour for evening

  • The light vehicle speed for evening

  • The heavy vehicle speed for evening

  • The slope (in %) of the road section

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