Resumen
A road in Spain was monitored with cameras with the objective of calibrating the TWOPAS model, which was successfully achieved with the information gathered. The model was also applied for estimating its Level of service, with and without a climbing lane, and for comparing the results with those obtained with the Highway Capacity Manual (HCM) procedure. The basic indicators were Percent Time Spent Following (PTSF) and Average Travel Speed (ATS). As a result, it is concluded that the two procedures show improvements on the climbing lane applicable on the field. However, changes are recommended to improve the estimation