CONCERNING VISIBILITY CONDITIONS IN RELATION TO UPHILL GRADIENTS ON HIGHWAYS

SULLE CONDIZIONI DI VISIBILITA IN CORRISPONDENZA DEI DOSSI STRADALI

A methodology is presented for evaluating visibility conditions in relation to vertical crests on ordinary single carriageway roads. Special attention is paid to the question of intermediate visibility between stopping distances and overtaking distances, and a mathematical definition is presented prescribing the zones in which an overtaking manoeuvre already begun can be finished, but no new one initiated. The vertical transition curves developed in this paper are based on the Italian CNR standards for road layout, but it is pointed out that they can be applied in relation to any other highway design standards. (TRRL)

• Corporate Authors:

  Casa Editrice la fiaccola

  Via Carlo Ravizza 62
  Milano,   Italy 
• Authors:
  • Daleati
  • RINELLI, S
• Publication Date: 0

Language

• Italian

Media Info

• Features: Figures; Tables;
• Pagination: p. 233-244
• Serial:
  • Rivista della Strada
  • Volume: 48
  • Issue Number: 452
  • Publisher: Casa Editrice la fiaccola

Subject/Index Terms

• TRT Terms: Alignment; Design standards; Highway design; Highway grades; Passing; Slopes; Visibility
• Old TRIS Terms: Hillslopes
• ITRD Terms: 2894: Alignment; 2806: Gradient; 2855: Highway design; 1665: Safety; 2892: Transition curve; 9087: Vertical; 6783: Visibility
• Subject Areas: Highways; Operations and Traffic Management; Planning and Forecasting; Safety and Human Factors; I21: Planning of Transport Infrastructure;

Filing Info

• Accession Number: 00310375
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Jun 26 1980 12:00AM