DIESEL EXHAUST AS A HINDRANCE TO VISIBILITY IN ROAD TUNNELS

DIESELABGAS ALS SICHTBEHINDERNDER STOFF IN STRASSENTUNNELN

Visibility distance in road tunnels is, apart from avoidable dust, almost exclusively impaired by carbon from diesel exhaust. For the estimation of the opaqueness of the air for surveying or control purposes it is necessary to give preference to optical values, particularly the coefficients of extinction, since gravimetric values allow no conclusions about the reduction in visibility and are laborious to measure. With the given calculation process it is possible to estimate visibility distances to a defined obstruction along the carriageway, relative to the coefficients of extinction, the carriageway luminance and to their uniformity. Diagrams of the relation between lighting and ventilation form the basis for optimisation. By comparative measurements in Austrian road tunnels and in a special laboratory testing structure it is possible to establish the correlation between various tunnel surveillance instruments. /TRRL/

  • Corporate Authors:

    Technical University of Graz, Austria

    Reichbauerstrasse 12
    8010 Graz,   Austria 
  • Authors:
    • Puchwein, H
  • Publication Date: 1977-3

Language

  • German

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 126 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00189384
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • Report/Paper Numbers: Thesis
  • Files: ITRD, TRIS
  • Created Date: Mar 28 1979 12:00AM