Podcast
Questions and Answers
Which of these is NOT a primary factor considered when calculating stopping sight distance?
Which of these is NOT a primary factor considered when calculating stopping sight distance?
- Color of the vehicle (correct)
- Driver reaction time
- Road surface friction
- Vehicle speed
What effect does an upward gradient have on the required stopping sight distance?
What effect does an upward gradient have on the required stopping sight distance?
- Decreases the stopping sight distance (correct)
- Doubles the stopping sight distance
- Has no effect on the stopping sight distance
- Increases the stopping sight distance
For a two-way traffic scenario on a single lane, how is the stopping sight distance (SSD) typically adjusted?
For a two-way traffic scenario on a single lane, how is the stopping sight distance (SSD) typically adjusted?
- SSD remains the same
- SSD is tripled
- SSD is doubled (correct)
- SSD is halved
Which value is typically used for driver reaction time in standard stopping sight distance calculations?
Which value is typically used for driver reaction time in standard stopping sight distance calculations?
What does the variable 'f' represent in the stopping sight distance formula: $SSD = vt + \frac{v^2}{2g(f+G)}$?
What does the variable 'f' represent in the stopping sight distance formula: $SSD = vt + \frac{v^2}{2g(f+G)}$?
Flashcards
Stopping Sight Distance (SSD)
Stopping Sight Distance (SSD)
The minimum distance a driver needs to see ahead to safely stop their vehicle without hitting anything.
Reaction Time
Reaction Time
The time it takes a driver to react to a hazard, typically around 2.5 seconds.
Friction
Friction
The resistance between a vehicle's tires and the road surface, which affects braking.
Gradient
Gradient
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Sight Distance for Two-Way Traffic
Sight Distance for Two-Way Traffic
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Study Notes
Sight Distance
- Sight distance is the minimum distance needed for a driver to see and react to an object or hazard on the road.
- Features of the road and height of the object affect the sight distance.
- Height of objects (Hy) and height of the driver (HT).
- Stopping sight distance is the distance needed to stop a vehicle safely if the object is ahead.
- It's the distance visible to the driver ahead to stop the vehicle without collision.
- It depends on the vehicle speed and time taken to react.
Stopping Sight Distance
- Stopping sight distance (SSD) is the distance required for a driver to see an object and stop the vehicle safely.
- The formula for calculating SSD is SSD = vt + (v² / 2g f +g).
- Where:
- v = speed of the vehicle
- t = reaction time
- g = acceleration due to gravity
- f = coefficient of friction
- SSD depends on:
- Reaction time
- Speed of the vehicle
- Friction
- Gradient—if the gradient is upward
- Braking efficiency
Other Considerations
- Night driving has a different definition for stopping sight distance.
- Two-way traffic requires a doubled stopping sight distance (SSD = 2×SSD).
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Description
This quiz covers essential concepts of sight distance and stopping sight distance for drivers. Understand the key factors affecting visibility and safe stopping, including reaction times, speed, and road features. Test your knowledge with calculations and definitions related to road safety.