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?
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?
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?
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?
Signup and view all the answers
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: $SSD = vt + \frac{v^2}{2g(f+G)}$?
Signup and view all the answers
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).
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
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.
