Design Hour Pdf For Free

Design Hour Volume The DHV is a two-way traffic volume that is determined by multiplying the ADT by a percentage called the K-factor. Values for K typically range from 8 to 12% for urban facilities and 12 to 18% for rural facilities.

Design Hour Volume The DHV is a two-way traffic volume that is determined by multiplying the ADT by a percentage called the K-factor. Values for K typically range from 8 to 12% for urban facilities and 12 to 18% for rural facilities.

What is the Design Hour Factor (K-Factor)? The Design Hour Factor or K-Factor is the proportion of Annual Average Daily Traffic (AADT) that occurs during the peak hour. For the peak hour volume several options exist. K-30 is the 30th highest hourly volume of the year expressed as a percentage of the AADT.

The Peak Hour Factor (PHF) compares the traffic volume during the busiest 15-minutes of the peak hour with the total volume during the peak hour. It indicates how consistent traffic volume is during the peak hour.

Directional factor (D-factor) is the traffic volume proportion moving in the higher volume direction during the peak hour to the combined volume in both directions during the peak hour.

The peak hour factor (PHF) is found by dividing the peak hour volume by four times the peak 15 minute volume. The actual (design) flow rate can be calculated by dividing the peak hour volume by the PHF, 464/0.86 = 540 pcu/hr, or by multiplying the peak 15 minute volume by four, 4 * 135 = 540 pcu/hr.

ADT (Average Daily Traffic): The total traffic volume during a given time period, ranging from 2 to 364 consecutive days, divided by the number of days in that time period, and expressed in vpd (vehicles per day).