1. Find the stopping sight distance (in feet) for traveling downhill at a grade of 3%...
1. Find the stopping sight distance (in feet) for traveling downhill at a grade of 3% and speed of 60 mph, assuming driver’s perception and reaction time of 2.5 sec and a deceleration rate of 9.3 ft/s2.
2. A temporary diversion has been constructed on a highway of
+3% grade due to major repairs that are being undertaken on a
bridge. The maximum speed allowed on the diversion is 25 mi/h.
Determine the minimum distance from the diversion that a road sign
should be located informing drivers of the temporary change on the
highway. Assume that a driver can read a road sign within his or
her area of vision at a distance of 30 ft for each inch of letter
height.
Speed limit on highway = 65 mi/h
Letter height of road sign = 8 inches
Perception-reaction time = 2.5 sec
Homework Answers
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1. Find the stopping sight distance (in feet) for traveling
downhill at a grade of 3%...
6. Determine the sight stopping distance (in feet) on a highway with a-2% grade if the...
6. Determine the sight stopping distance (in feet) on a highway with a-2% grade if the design speed is 60 mph. Assume a perception reaction time of2 ft/s2. Answer-489.6
28. A car is traveling downhill on a suburban road with a grade of 3% at...
28. A car is traveling downhill on a suburban road with a grade of 3% at a speed of 35 mi/h. Determine the stopping sight distance based on a reaction time of 2.5 second, and a deceleration rate of 11.2 ft/s2. 257.08 ft b. 236.63 ft 249.15 ft d. 254.23 ft a. C.
What is the minimum stopping sight distance (SSD) that should be provided on a highway that...
What is the minimum stopping sight distance (SSD) that should be provided on a highway that has a design speed of 75 mph and a maximum grade of -6%? Assume the perception reaction time = 2.5 sec.
Stopping sight distance (SSD) is defined as the distance needed for a driver to see an object on the roadway and t...
Stopping sight distance (SSD) is defined as the distance needed for a driver to see an object on the roadway and then stop before colliding with it. It's composed of the distance to react on first seeing the object and then the distance to stop after the brake is engaged. The following is a formula for determining stopping sight distance: ssi) = (. | c:/ + |-. SSD is the stopping sight distance (m or ft e is the conversion...
While a car was operated at 60 mph on a freeway, the driver saw a box...
While a car was operated at 60 mph on a freeway, the driver saw a box on the road ahead and tried to stop the car. The highway grade is -2%. Assume the maximum deceleration rate of the car is 11.2 ft/sec^2 and the perception-reaction time is 2.5 sec. Calculate the stopping sight distance.
Determine the sight distance leg along the railroad tracks in ft. A two lane road crosses...
Determine the sight distance leg along the railroad tracks in
ft.
A two lane road crosses an at grade railroad track at 90°. If the design speed of the two lane road is 50 mi/h and the velocity of the train when crossing the highway is 90 mi/h, determine the sight distance leg (in ft) along the railroad tracks to permit a vehicle traveling at the design speed to safely cross the tracks when a train is observed at a...
9:381 LTE Problem 1 A crest vertical curve is to be designed to join a +2% grade with a-2% at a s...
9:381 LTE Problem 1 A crest vertical curve is to be designed to join a +2% grade with a-2% at a section of a two-lane highway. Determine the minimum length of the curve if the design speed of the highway is 60 mph and SL. Assume that a-9.34 ftsec' and that the perception-reaction time is 2.5 sec. Problem2 A crest vertical curve is to be designed to join a +3% grade with a-2% grade at a section of a two-lane...
Please help and thank you! Determine the required stopping sight distance. 18. A vehicle is travelling...
Please help and thank you!
Determine the required stopping sight distance. 18. A vehicle is travelling with a speed of 40 mph over an equal tangent vertical curve which has an initial grade of +4.0% and final grade of-2.000. If the height of the driver's eye if 6.0 ft and the driver spots a car 460 ft away with a height of 4.0 ft, what is the minimum length of the vertical curve for this situation?
2. Reaction time, operation speed, and roadway longitudinal grade are the three primary factors impacting stopping...
2. Reaction time, operation speed, and roadway longitudinal
grade are the three primary factors impacting stopping sight
distance.
(1) Fill in the numbers in the table below.
(2) Plot the relationships between ds and the three
influencing factors.
(3) Provide your observations by comparing how the three
factors impact on stopping sight distance, and discuss how the
results may influence roadway design.
l Verizon 9:07 AM 84% Back Hwk01_F19-3.docx 2. Reaction time, operation speed, and roadway longitudinal grade are the...
1) Calculate the safe stopping distance for a section of rural road with a design speed...
1) Calculate the safe stopping distance for a section of rural road with a design speed of 90 mi/h on a 4% upgrade? Use standard deceleration rate if 11.2 ft/sec2 a) 942.59 ft b) 1076.60 ft c) 865.15 ft d) 1139.13 ft
6. Determine the sight stopping distance (in feet) on a highway with a-2% grade if the design speed is 60 mph. Assume a perception reaction time of2 ft/s2. Answer-489.6
28. A car is traveling downhill on a suburban road with a grade of 3% at a speed of 35 mi/h. Determine the stopping sight distance based on a reaction time of 2.5 second, and a deceleration rate of 11.2 ft/s2. 257.08 ft b. 236.63 ft 249.15 ft d. 254.23 ft a. C.
Stopping sight distance (SSD) is defined as the distance needed for a driver to see an object on the roadway and then stop before colliding with it. It's composed of the distance to react on first seeing the object and then the distance to stop after the brake is engaged. The following is a formula for determining stopping sight distance: ssi) = (. | c:/ + |-. SSD is the stopping sight distance (m or ft e is the conversion...
Determine the sight distance leg along the railroad tracks in
ft.
A two lane road crosses an at grade railroad track at 90°. If the design speed of the two lane road is 50 mi/h and the velocity of the train when crossing the highway is 90 mi/h, determine the sight distance leg (in ft) along the railroad tracks to permit a vehicle traveling at the design speed to safely cross the tracks when a train is observed at a...
9:381 LTE Problem 1 A crest vertical curve is to be designed to join a +2% grade with a-2% at a section of a two-lane highway. Determine the minimum length of the curve if the design speed of the highway is 60 mph and SL. Assume that a-9.34 ftsec' and that the perception-reaction time is 2.5 sec. Problem2 A crest vertical curve is to be designed to join a +3% grade with a-2% grade at a section of a two-lane...
Please help and thank you!
Determine the required stopping sight distance. 18. A vehicle is travelling with a speed of 40 mph over an equal tangent vertical curve which has an initial grade of +4.0% and final grade of-2.000. If the height of the driver's eye if 6.0 ft and the driver spots a car 460 ft away with a height of 4.0 ft, what is the minimum length of the vertical curve for this situation?
2. Reaction time, operation speed, and roadway longitudinal
grade are the three primary factors impacting stopping sight
distance.
(1) Fill in the numbers in the table below.
(2) Plot the relationships between ds and the three
influencing factors.
(3) Provide your observations by comparing how the three
factors impact on stopping sight distance, and discuss how the
results may influence roadway design.
l Verizon 9:07 AM 84% Back Hwk01_F19-3.docx 2. Reaction time, operation speed, and roadway longitudinal grade are the...
1) Calculate the safe stopping distance for a section of rural road with a design speed of 90 mi/h on a 4% upgrade? Use standard deceleration rate if 11.2 ft/sec2 a) 942.59 ft b) 1076.60 ft c) 865.15 ft d) 1139.13 ft
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