Determine the minimum length of a sag vertical curve if the grades are -4% and +2%. The design speed is 70 mph. Assume the driver's reaction time is 2.5 seconds and the deceleration rate is 11.2 ft/s². Use the standard headlight criteria and riding comfort criteria from the FE SSD equations and select the largest curve length that meets the assumptions.
Determine the minimum length of a sag vertical curve if the grades are -4% and +2%. The design speed is 70 mph. Assume the driver's reaction time is 2.5 seconds and the deceleration rate is 11.2 ft/s². Use the standard headlight criteria and riding comfort criteria from the FE SSD equations and select the largest curve length that meets the assumptions.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Determine the minimum length of a sag vertical curve if the grades are -4% and +2%. The design speed is 70 mph. Assume the driver's reaction time is 2.5 seconds and the deceleration rate is 11.2 ft/s². Use the standard headlight criteria and riding comfort criteria from the FE SSD equations and select the largest curve length that meets the assumptions.
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Step 1: Given
VIEWStep 2: Calculate stopping sight distance (SSD)
VIEWStep 3: Calculate length of sag vertical curve based on standard headlight criteria
VIEWStep 4: Calculate length of sag vertical curve based on riding comfort criteria
VIEWStep 5: Select the length that meets the assumptions.
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