Introduction about the parking, roundabout and traffic signal system

1. A
BRIEF INTRODUCTION
TO
ROAD JUNCTION DESIGN,
PARKING AND SIGNAL DESIGN
Prepared By
Akshay Galav
IV Year, Civil Engineering

2. CONTENT
 Principles of Road Junction design
 Design of Roundabouts
 Parking Lots
 Design of Signals
 Illustrative Examples

3. ROAD JUNCTION
 Road junction are places where two or more roads
meet or cross each other at different angles.
 It is used for reduction of accidents and enhace
durability
 It helps to reduce the traffic congestion, increases
smoothness of traffic flow.

4. PRINCIPLES OF ROAD JUNCTION DESIGN
 Intersection as far as possible, be at right angle and
acute crossing, should be avoided.
 Sufficient space should be provided for proper visibility
and also for future extension and improvement.
 Change of road gradient should be neglected.
 Round About should be used when more than three
roads are crossed each other.
 Pedestrian crossing should properly arranged.

5. Types of
road junction
Square
Junction
Y Junction
Acute
Junction
T-Junction
Staggered
Junction
Multiple
Junction

6. SQUARE JUNCTION
 These junction are provided
where two equal distance
roads are nearly same
width, cross each other at
right angles.
 Shape of square junction is
dependent on site
situations.

7. Y JUNCTION
 When two roads
are meet each
other, but don’t
cross each other is
formed Y-junction.

8. ACUTE JUNCTION
 When two main roads
or cross each other at
an angle than right
angle.

9. T-JUNCTION
 When two roads
meet but don’t
cross at right
angle.

10. MULTIPLE JUNCTION
 When Multiple
roads are
connected each
other at any angle.

11. ROUNDABOUT
 Definition- A traffic circle with
certain prescribed
characteristics.
 Community enhancement
 Traffic Calming
 Safety
 Reduced delay at lower
volumes
 Improved left turn treatment
 Complex intersections

12. ROUNDABOUT

13. DESIGN OF ROUNDABOUT
S.
N.
Width of the
approach
road or
carriageway
Curve
Radius
at
Entry
Width of
carriage
way and
entry anti
exit of
curvature
1. 7.0m 25m-
35m
6.5m
2. 10.5m 25m-
35m
7.0m
3. 7.0m 25m-
35m
7.0m
4. 10.5m 25m-
35m
7.5m
As per IRC central island dia. Is equal to 1.33 times of entry
radius

14. PARKING
 A space for resting of vehicle is called parking.

15. Classification of
Parking
1. On Street
Parking
Unrestricted
curb parking
Restricted curb
parking
2. Off Street
Parking
Garages
Surface Lot
3. Based on
Operations
Parallel Parking
Angle Parking
Right Angle
Parking

16. ON STREET PARKING
 When side space of road is used for parking of
vehicle is called on street parking.

17. OFF STREET PARKING
 Vehicles are parked apart from road side is called
off street parking.
Garage parking/Underground
Parking
Surface Lot

18. BASED ON OPERATIONS
 Parallel Parking
 Vehicles are parked parallel to
road side.
 A minimum 1.2m safe distance
sis maintained between
vehicles.

19. BASED ON OPERATIONS
 Angle Parking
 It provides more space
and comfort to driver of
vehicle.
 It is more convenient to
congested area.

20. BASED ON OPERATIONS
 Right Angle Parking
 It is used on steep
slops.
 It is recommended for
residential area.

21. TRAFFIC SIGNALS
 Signal which are used for
controlling or moving of vehicles is
called traffic signals.
 It enhance orderly movement of
vehicles.
 Control the speed on main and
cross roads.
 Help in directing the traffic on
different roads.
 It increases safe movement of
vehicles.

22. TRAFFIC SIGNS
1.Regulatory
Sign
2. Warning Sign
3.Informative
Sign
4. Traffic Control

23. REGULATORY SIGN
 Traffic signs that regulate
roadways to help drivers use the
roadways in an orderly fashion.
 Regulatory signs use the
following shapes: octagon ,
equilateral triangle with the point
down and vertical rectangle
 The colors used for regulatory
signs are red and white .

24. WARNING SIGN
 This signs are used to warn drivers
and allow adequate time for a
cautious response.
 This signs are often diamond-
shaped , pentagon-shaped and
potential obstructions ahead.
 The colors used for warning signs
are yellow and green because these
are brighter color makes these signs
more visible in foggy or rainy
conditions.

25. INFORMATIVE SIGN
 Informative traffic signs, also
known as guide signs.
Informative signs are green,
blue or white.
 Informative signs are often
horizontally rectangular, while
roadway designation signs can
be shaped like shields or
rectangles.

26. TRAFFIC CONTROL
Traffic Control
Traffic
Actuated
Signal
Fully Actuated
TS
Semi Actuated
TS
Fixed Time
Signals

27. FIXED TIME SIGNALS
 These signals are set to
repeat regularly in fixed
cycle.
 Cycle regulates yellow, red
and green lights in a fixed
way.
 Generally, duration of
green and red light are
same.
 Time duration of light is
dependent on traffic flow,
traffic flow should be
minimum.

28. TRAFFIC ACTUATED SIGNAL
 Fully Actuated TS
 It is automatically controlled traffic signals for
moving of vehicles.
 All major and minor roads consist detectors for
controlling of traffic signals.
 Detectors are based on load/pressure of vehicle
on road surface.

29. FULLY ACTUATED TS
 Semi Actuated TS
 It is also automatically controlled traffic signals for
moving of vehicles.
 All minor roads consist detectors for controlling of
traffic signals.
 It is used at high density, heavy volume and high
speed or express way meets a very light cross
traffic.
 Detectors are based on load/pressure of vehicle on
road surface.

30. ILLUSTRATIVE EXAMPLES

31. ILLUSTRATIVE EXAMPLES

32. ILLUSTRATIVE EXAMPLES

33. ILLUSTRATIVE EXAMPLES