20 Abbreviations Used in Highway Engineering

Abbreviation Meaning
AADT Average Annual Daily Traffic
ADT Average Daily Traffic
BRT Bus Rapid Transit
LOS Level of Service
PCU Passenger Car Unit
SRN Strategic Roads Network
LRN Local Roads Network
DOR Department of Roads
SDI Surface Distress Index (PSC 2075)
IRI International Roughness Index
DOLIDAR Department of Local Infrastructure Development and Agricultural Roads
DOLI Department of Local Infrastructure
IRC Indian Road Congress
NRS Nepal Road Standard
NURS Nepal Urban Road Standard
NRRS Nepal Rural Road Standard
NS Nepal Bureau of Standard
SD Sight Distance
SSD Stopping Sight Distance
DRCN District Road Core Network
CBD Central Business District

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