A vertical curve was designed in 2005 for SSD requirements at a design speed of 120 km/h to connect grades G1=+2% and G2=-3%. The curve is to be redesigned for the same design speed in 2025. Vehicle braking technology has advanced such that the vehicle deceleration rate has increased by 40% relative to the 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%. Compute the difference in design curve lengths for the 2005 and 2025 designs based on Australian guidelines.

A vertical curve was designed in 2005 for SSD requirements at a design speed of 120 km/h to connect grades G1=+2% and G2=-3%. The curve is to be redesigned for the same design speed in 2025. Vehicle braking technology has advanced such that the vehicle deceleration rate has increased by 40% relative to the 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%. Compute the difference in design curve lengths for the 2005 and 2025 designs based on Australian guidelines.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Related questions

Q: A vehicle weighing 2000-lb is traveling 30 mph at 5% upgrade with rate of 6 ft/sec². The vehicle has…

A: solution: Given: vehicle weight = 2000 lb. speed = 30 mph grade = +5% acceleration rate = 6ft/sec2…

Q: car is traveling downhill on a suburban road with a grade of 4% at a speed of 35 mph. Determine the…

Q: A superspeedway in New Delhi has among the highest super-elevation rates of any track on the Indians…

Q: the required superelevation is

A: Given data, A highway is designed fro, v= 80 km/h radius,r= 250 m Determine the required…

Q: Determine the appropriate speed for a section of 2 lane highway with a horizontal curve (1/4 mi…

A: Given Radius of curve = 1/4 mi = 402.336 meter…

Q: Problem 2. Consider a freeway section with three lanes in each direction and with a length of 1.25mi…

A: First condition-Without Bus Removal: The peak hour volume is V=3800 veh/h. The total vehicles are,…

Concept explainers

Drainage of Pavements

Pavement Drainage holds ample significance, as it prevents the accumulation of water or any liquid on the surface of pavements and ensures proper drainage system. With proper design and gradual slopes provided, the water gets easily removed from the surface into the drains, which are essential during heavy rains and unusual weather conditions keeping it less prone to accidents and increasing the durability of the pavement structure.

Question

A vertical curve was designed in 2005 for SSD requirements at a design speed of 120 km/h to
connect grades G1=+2% and G2=-3%. The curve is to be redesigned for the same design speed
in 2025. Vehicle braking technology has advanced such that the vehicle deceleration rate has
increased by 40% relative to the 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%. Compute the difference in design curve lengths for the 2005 and 2025 designs based on
Australian guidelines.

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step 3

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 3 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.

Similar questions

The 4 northbound lanes of a rural freeway segment have 13 ft lane widths. There is no lateral clearance afforded on either side of the road. There are no ramps within the area of influence. What is the estimated FFS (mph)? Provide your answer to the nearest tenths. Response Feedback: The BFFS of 75.4 mph is adjusted by 1.2 mph for the lack of lateral clearance.
II. A student trying to test the braking ability of her car determined that she needed 19.5 ft more to stop her car when driving downhill on a road segment of 5% grade than when driving downhill at the same speed along another segment of 3.5% grade. Determine the speed at which the student conducted her test and the braking distance on the 5% grade if the student is traveling at the test speed in the uphill direction. - 30 points
A traffic stream is moving at a steady state when entering a mountain grade. Upon entering the grade, the speed, density and flow are 72 km/h, 25 veh/km and 1800 veh/hr respectively. On the grade, a truck drops to a speed of 15 km/h causing traffic to bunch up to a density of 85 veh/km. When the truck pulls over, traffic accelerates to the maximum flow until steady state flow conditions resume. Calculate (a) the flow of traffic behind the truck on the mountain grade (b) the jam density and free flow speed for this road (c) the density and speed when traffic resumes a steady state flow (d) the maximum flow
solve
A new four-lane divided multilane highway (two lanes in each direction) is being planned with 12-ft lanes, 6-ft shoulders on both sides, and a 50-mi/h speed limit. One 3% downgrade is 4.5 mi long, and there will be 4 access points per mile. The peak-hour directional volume along this grade is estimated to consist of 1800 passenger cars, 140 SUTs, and 60 TTs. If the peak-hour factor is estimated to be 0.85, what level of service will this segment of highway operate under? What is the percent trucks - PT? What is the value of the passenger car equivalence factor - ET? What is the heavy vehicle factor - fHV? What is the median adjustment factor - fM?
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 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 3.4m/s2 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 0.9 m above pavement. Compute the difference in design curve lengths for the 2006 and 2050 designs. Assume heye =1.08 and hobs = 0.60 m.