The following abbreviations have been used in this report:

AADT Annual Average Daily Traffic

ATC Automatic Traffic Counter

BCR Benefit to Cost Ratio

DMRB Design Manual for Roads and Bridges

NPV Net Present Value

NRTF National Road Traffic Forecasts

RSA Road Safety Audit

S2 Single 2-Lane Carriageway

STAG Scottish Transport Appraisal Guidance

WS2 Wide Single 2-Lane Carriageway