# When required tpr=2.5 s and amax=3.4 m/s2 A vertical curve was…

When required tpr=2.5 s and amax=3.4 m/s2 A vertical curve was…

# When required tpr=2.5 s and amax=3.4 m/s2

A vertical curve was designed in 2006 for SSD requirements at a design speed of 120 km/h to connect grades G1= +1% and G2= -2%. The curve is to be redesigned for a 120-km/h design speed in the year 2050.Vehicle braking technology has advanced such that vehicle deceleration rate has increased by 40 % relative to 3.4 ????/????2 value used in the original design. However, due to the higher percentage of older people in the driving population, design reaction times have increased by 20%. Also, because vehicles have become smaller, the driver’s eye height is assumed to be 0.9m above pavement. Compute the difference in design curve lengths for the 2006 and 2050 designs.

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