A new four lane divided highway is to be constructed on a subgrade of CBR 1.8%. The ADT of commercial truck traffic based on the last count was 8000 (in both the directions). The directional split of traffic is 65:35. Vehicle Damage Factor (VDF) based on axle load survey was 3.0. The pavement section is to be designed for a life span of 15 years. The last traffic count was taken 1 year back and the project would be completed in 2 years from now. The growth rate of traffic = 8%. The design cumulative standard axles on the road will be equal to

A new four lane divided highway is to be constructed on a subgrade of CBR 1.8%. The ADT of commercial truck traffic based on the last count was 8000 (in both the directions). The directional split of traffic is 65:35. Vehicle Damage Factor (VDF) based on axle load survey was 3.0. The pavement section is to be designed for a life span of 15 years. The last traffic count was taken 1 year back and the project would be completed in 2 years from now. The growth rate of traffic = 8%. The design cumulative standard axles on the road will be equal to

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter19: Design Of Flexible Highway Pavements

Section: Chapter Questions

Problem 8P

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Determine the L.O.S of the road if PHF = 0.88, D= 60%, K=O.11, V=115 kph? For an Existing 4 lane freeway having the following features: • Lane and shoulder width = 12 ft, 6 ft, weekday commuter • Percent of trucks and buses = 8% and 4% respectively and Et =2.5, Eb =2.2• AADT = 35200 veh/day, Assume lane capacity * 2000 pc/hr
Q: The expected daily traffic (AADT) for tow-way on a major six-lane flexible pavement highway consists of trucks of type 1 and 2 with equivalency factors as follow: type1 truck 1000/day(2. way) type2truck 500/day (2 way) 24kips(single) 24Kips(Tandem) 12kips(single) Equiv. 3.22 0.450 0.010 factor 24kips(single) 3.22 12 kips(Tandem) 0.026 Performance penod-15 years, annual growth rate=4%, tirectional distribution percent -70%, design lane percent 80 %, required structural number for subgrade = 5.7, asphalt concrete surfacing layer coefficient (4,-0.42), asphalt concrete base layer coefficient (a₂-034), gravel and soil subbase layer coefficient (93-0.12) and the modify drainage coefficient (m = 1.0) for all pavement courses Find the equivalent single axle load (ESAL) and draw a simple sketch of designed three pavement thickness courses with all necessary calculations?
The traffic projection for a new pavement of a two-lane rural dual carriageway is as follows: Design period = 25 years AADT in current year = 5000 vehicles per day Direction factor = 0.5 Percent of heavy vehicles = 6% Annual traffic growth = 6% Damage index: ESA/HVAG = 0.75; SAR5/HVAG = 0.95; SAR7/HVAG = 1.65; SAR12/HVAG = 19.65. %3D %3D Table 2 Traffic load distribution Load (kN) SAST SADT TAST TADT TRDT 70 0.21 0.12 0.31 0.18 0.21 80 0.34 0.29 0.21 0.48 0.41 90 0.45 0.59 0.48 0.34 0.38 Proportion of each axle group 0.136 0.294 0.315 0.103 0.152 a) Calculate the average number of axle groups per heavy vehicle NHvaG Using the data in the Table. b) Calculate the design traffic in HVAG (NDT). c) Calculate the design traffic in ESA, SAR5, SAR7 and SAR12.
A proposed highway is to be designed with adequate shoulder and clearance in a level terrain with the following: AADT = 25,000 pcu/day D% = 65% K = 9%. Estimate the number of lanes that will provide LOS C.
Calculate the design traffic in million standard axles (MSA) and commercial vehicles per day (CVD) required for design of flexible pavement as per current Indian procedure (revised IRC method) for the following data: (i) Annual daily commercial vehicles at last count (May 2008) = 200 (ii) Rate of traffic growth = 6% (iii) Design life = 10 years (iv) Vehicle damage factor = 2 (v) The road is proposed to be completed in May 2011.
an 39. It is proposed to widen and strengthen existing 2-lane NH section as a divided highway. The existing traffic in one direction is 2500 commercial vehicles (CV) per day. The construction will take 1 year. The design CBR of soil subgrade is found to be 5 percent. Given: traffic growth rate for CV = 8 percent, vehicle damage factor = 3.5 (standard axles per CV), design life = 10 years and traffic distribution factor = 0.75. The cumulative standard axles (msa) computed are (a) 35 (b) 37 (c) 65 (d) 70
The improper alignment of road will not result in A. Increase of construction cost B. Increase of maintenance cost OC. Increase of population D. Increase of accidents
A new 50 km freeway was required to constructed between two cities with design speed 70 mph, the expected 20 year DHV was 12000 vph on a regular weekday, rolling terrain, PHF pf 0.95, directional split of 65%, a heavy vehicle adjustment factor of 0.85 and the suggested L.O.S to reach end design period is B (v/c=0.54), if the one lane cost per kilometer was 25000$. What will be the saving of money if the operating L.O.S at the end of design period change to be L.O.S C (c/v=0.77)?Assume: the lane and shoulder width are ideal, lane capacity * 2000 pc/hr
Determine the LOS on a regular weekday on a 1.5-mile segment of an 8-lane freeway (four lanes in each direction) in rolling terrain. Use the following data.
a segment of freeway consists of two upgrades of 2%, 800 m long and 3% 600 m long. Determine the PCE trucks/buses and recreational vehicles on this composite upgrade if 6% of vehicles are truck and 10% are recreational vehicles. Determine the number of lanes required for a freeway section if the section is to operate at LOS C. The input parameters include: One Cloverleaf interchange per mile (ramp density = 4 ramps/mile or 2.5 ramps/km) lane width = 12 fr (3.6m) right-side lateral clearance = 6years (1.8m) traffic composition: 10% trucks, 2% RVs V = 3000 veg/h Number of lanes: Must be greater than or equal to 2 Pero direction PHF = 0.95 Analysis segment is (0.35 miles (0.56km)) long with 4.5 % grade
A particular roadway segment has a 6000-ft section of 3% upgrade, followed by a 5000-ft section of 5% upgrade. The traffic on the road includes 8% trucks and 4% recreational vehicles. Determine the PCEs.
A proposed highway is to be designed with adequate shoulder and clearance ina level terrain with the following: AADT = 25,000 pcu/day D% = 65% K = 9% Estimatethe number of lanes that will provide LOS C. SHOW COMPLETE SOLUTION