![]() Guard-rails must be provided at a sutitable height. Protect vehicles from accidents with abutments or piers. This is essential especially for important routes like National and State Highways to be widened soon from single-lane to two-lane standards, as also busy two-lane roads which are in the planning stage for being upgraded to a four-lane divided cross-section. ![]() Since width at an existing underpass cannot be easily increased later on, initial construction should be sufficient for the standards to which the underpass roadway would need to be improved within the near future. From considerations of cost, these treatments are meant for higher categories of roads, especially with divided carriageways. Where it becomes inescapable to have structures with solid abutments, these should be set back from the roadway edge as much as possible, Fig. To promote a feeling of openness and unrestrained lateral clearance, preferably structures with open-end spans should be employed, Fig. Road profile should not dip too sharply under the structure as that will produce a considerably enhanced sense of restriction when compared with a profile that proceeds smoothly through. As far as possible, the underpass roadway should conform to the natural lines of the highway at the approaches as regards alignment, profile and cross-section. OVERALL CONSIDERATIONS 5.1.Ĭonscious effort must be made to create a sense of freedom for the drivers travelling through the underpass. Rural roads stand for roads of non-urban character. Vertical clearance stands for the height above the highest point of the travelled way, i.e., the carriageway and part of the shoulders meant for vehicular use, to the lowest point of the overhead structure. Lateral clerance is the distance between the extreme edge of the carriageway to the face of the nearest support whether it is a solid abutment, pier or column. Underpass implies a short passage beneath a grade-separated structure to carry one or more streams of traffic. The following definitions will be applicable for the purpose of this standard : 4.1. For pedestrian subways, another standard is proposd to be issued in due course. Guidance about clearances on cycle subways is contained in IRC: 11-1962 “Recommended Practice for the Design and Layout of Cycle Tracks”. Specific cases of subways meant for the exclusive use of cyclists or pedestrians are, however, not dealt with. The Standard covers both rural and urban roads. It is recommended that these may be followed uniformly on all roads throughout the country. 2.2.ĭesirable practices in this regard are indicated herein. In order that capacity, speed and safety of travel are not affected, the lateral and vertical clearances at underpasses must be adequate. Many times a road has to be taken through an underpass below another road, railway line, pipeline or irrigation facility like aquaduct. Finally, it was approved by the Council in their 82nd meeting held on the 2nd May 1974. Later, it was approved by that Committee in their meeting held at New Delhi on the 31st January and 1st February 1974 and then by the Executive Committee in their meeting held on the 1st May 1974. This Standard was first discussed by the Specifications & Standards Committee in their meeting held at Gandhinagar on the 30th November 1972. STANDARD FOR LATERAL AND VERTICAL CLEARANCES AT UNDERPASSES FOR VEHICULAR TRAFFIC 1. IRC: 54-1974 LATERAL AND VERTICAL CLEARANCES AT UNDERPASSES FOR VEHICULAR TRAFFIC Jai Gyan! END OF PREAMBLE (NOT PART OF THE STANDARD) Many of these materials are either unavailable or inaccessible in libraries in India, especially in some of the poorer states and this collection seeks to fill a major gap that exists in access to knowledge.įor other collections we curate and more information, please visit the Bharat Ek Khoj page. This item has been posted for non-commercial purposes and facilitates fair dealing usage of academic and research materials for private use including research, for criticism and review of the work or of other works and reproduction by teachers and students in the course of instruction. The purpose of this library is to assist the students and the lifelong learners of India in their pursuit of an education so that they may better their status and their opportunities and to secure for themselves and for others justice, social, economic and political. This library of books, audio, video, and other materials from and about India is curated and maintained by Public Resource. ![]() LATERAL AND VERTICAL CLEARANCES AT UNDERPASSES FOR VEHICULAR TRAFFIC PREAMBLE (NOT PART OF THE STANDARD)
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