Structural Analysis
6th Edition
ISBN: 9781337630931
Author: KASSIMALI, Aslam.
Publisher: Cengage,
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- Determine if a segment of 700 feet is safe for vehicles to decide to maneuver on a two-lane rural highway of 80 mph
speed.
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Step 1: Introduction:
To determine if a segment of 700 feet is safe for vehicles to maneuver on a two-lane rural highway with an 80 mph speed limit, we will need to consider several factors, including the stopping distance required for vehicles traveling at that speed.
1. Reaction Time: The first factor to consider is the driver's reaction time. This is the time it takes for a driver to perceive a hazard and react by applying the brakes. Reaction times can vary, but a typical value is around 1.5 seconds.
2. Braking Distance: Once a driver reacts, the vehicle will begin to decelerate. You'll need to calculate the braking distance required to bring the vehicle to a complete stop. Braking distance depends on factors like vehicle type, road conditions, and tire quality. A rough estimate might be around 300-400 feet for a typical car traveling at 80 mph on dry pavement
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- What is the safe stopping distance for the rural freeway section with design speed 80 miles/hour at 4% incline?arrow_forwardA 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 flowarrow_forwardThe 2 southbound lanes of a four-lane (i.e. 2 lanes each direction) urban freeway are 12 ft wide. There is at least 6 ft of lateral clearance on the right side of the outer/right lane. There are two ramps within the influence area (i.e. within 3 miles upstream and 3 miles downstream of the center of the segment. What is the estimated FFS (mph)? Provide the answer to the nearest tenths.arrow_forward
- 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?arrow_forwardA curve of radius 250 ft and e 0.08 is located at a section of an existing rural highway, which restricts the safe speed at this section of the highway to 50% of the design speed. This drastic reduction of safe speed resulted in a high crash rate at this section. To reduce the crash rate, a new alignment is to be designed with a horizontal curve. Determine the minimum radius of this curve if the safe speed should be increased to the design speed of the highway. Assume fs= 0.17 for the existing curve, and the new curve is to be designed with e = 0.08arrow_forwardA major roadway with a speed limit of 35 mi/h has an intersection that has no intersection control with a minor roadway at a right angle. A building is located next to the intersection at a distance of 50 ft from the center of the near lane on the major roadway and 40 ft from the center of the near lane on the minor roadway. At what speed for the minor roadway is the intersection safe? Grades are approximately level.arrow_forward
- Design speed of a six-lane undivided highway is 70 mph. A circular section of the highway has level grade, 10-ft wide lane, and the radius of the highway centerline is 1000 ft. Calculate the minimum side clearance required from the edge of the innermost lane on the highway to provide adequate sight distance for safe travelarrow_forwardA 4-lane divided highway has a highway grade of -1.5%. The minor road approach grade is 3.5%. The design speed is 45 mph for the major road and 40 mph for the minor road. Find the left turn departure sight distance for a passenger car turning left from the minor road to the major road, The answer should be in feet.arrow_forwardHow much space should be cleared between an obstruction and the center of a roadway (in ft) for a horizontal curve with 2-11 ft lanes if the design speed is 67 mph and the radius of the curve is 1,037?arrow_forward
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