Struct Classification::RoadCondition

Nested Relationships

This struct is a nested type of Struct Lane::Classification.

Struct Documentation

struct RoadCondition

The condition of the road surface.

Public Members

optional double osi3::Lane::Classification::RoadCondition::surface_temperature = 1

The temperature of the roads surface in Kelvin.

Unit: [K]

optional double osi3::Lane::Classification::RoadCondition::surface_water_film = 2

The height of the water film on top of the surface in mm.

Unit: [mm]

optional double osi3::Lane::Classification::RoadCondition::surface_freezing_point = 3

The temperature where the water on top of the surface would start to freeze or dew in Kelvin.

Unit: [K]

optional double osi3::Lane::Classification::RoadCondition::surface_ice = 4

The percentage of ice covering the road.

Unit: [%]

optional double osi3::Lane::Classification::RoadCondition::surface_roughness = 5

The coefficient representing the roughness or unevenness of the road. International Roughness Index (IRI) [1] values range from 0 = smooth ground (equivalent to driving on a plate of glass) up to 20 mm/m (a very rough road).

Estimated value ranges (IRI): 0.0 [mm/m] absolutely perfect evenness 0.3 - 1.8 [mm/m] airport runways and superhighways 1.4 - 3.4 [mm/m] new pavements 2.2 - 5.7 [mm/m] older pavements 3.2 - 9.8 [mm/m] maintained unpaved roads 4.0 - 11.0 [mm/m] damaged pavements 8.0 - > 20 [mm/m] rough unpaved roads

Speed of normal use (IRI): 30 [km/h] - 20 [mm/m] 50 [km/h] - 14.5 [mm/m] 60 [km/h] - 10.0 [mm/m] 80 [km/h] - 8.5 [mm/m] 100 [km/h] - 3.4 [mm/m]

Road conditions (IRI); 15 [mm/m] erosion gulleys and deep depressions 11 [mm/m] frequent shallow depressions, some deep 9 [mm/m] frequent minor depressions 5 [mm/m] surface imperfections

Unit: [mm/m]

References:

  • [1] SAYERS, M.W.; KARAMIHAS, S.M. Little Book of Profiling, University of Michigan Transportation Research Institute, 1998.

optional double osi3::Lane::Classification::RoadCondition::surface_texture = 6

The surface texture or fine roughness

Whereas the IRI-based roughness or unevenness measure only takes into account road wavelengths around 0.5m - 100m, the surface texture or fine roughness [2] measures only wavelengths below 0.5m. It is given as the standard height deviation of fine roughness

Unit: [m]

References:

  • [1] SAYERS, M.W.; KARAMIHAS, S.M. Little Book of Profiling, University of Michigan Transportation Research Institute, 1998.

  • [2] SCHNEIDER, R.: Modellierung der Wellenausbreitung fuer ein bildgebendes Kfz-Radar, Dissertation, Universitaet Karlsruhe, Mai 1998.