Roles in vehicle movement and safety
• Provide support of vehicle loads
• Provides friction
• Ensure smooth vehicle movement
• Enhances visibility and guidance
• Improves drainage and reduces hazards.
1/20
| Term | Definition |
|---|---|
Roles in vehicle movement and safety | • Provide support of vehicle loads
• Provides friction
• Ensure smooth vehicle movement
• Enhances visibility and guidance
• Improves drainage and reduces hazards.
|
Road pavements | • Asphalt
• Concrete
|
Factors affecting surface performance | • Traffic Loads
• Weather Conditions
• Maintenance Practices
• Material Quality
|
Types of Guideways | • Road Guideways
• Rail Guideways
• Air Guideways
• Water Guideways
• Specialized or Dedicated Guideways
|
Design Consideration and Challenges | • Traffic Load
• Safety
• Environmental & Climatic Conditions
• Cost & Maintenance
|
Impact of transportation on storm water | • The urbanization effect
• Contaminant Sources
• The Runoff problems
|
Queue Discipline | - FIFO (First-in, First Out)
- LIFO (Last-in, First Out)
- Random Priority Service
|
Elements of Traffic System | Driver
Vehicle
Roadway
|
LEVEL OF SERVICE | • Los A - Free Flow
• Los B - Stable Flow
• Los C - Stable but restricted
• Los D - Approaching Unstable
• Los E - At Capacity
• Los F - Forced Flow/ Congestion
|
Road Way Factors | • Lane width
• Number of Lanes
• Road Condition
• Curves and Grades
|
Traffic Factors | • Traffic Composition
• Heavy Vehicles
• Turning Vehicles
|
Control Factors | • Traffic Signal
• Stop Signs
• Intersections
|
Environmental Factors | • Weather
• Visibility
• Road Incidents
|
FREEWAY COMPONENTS | - Basic Freeway segments
- Weaving Areas
- Ramp Junctions
|
Two Types of Traffic Density | - Low Traffic Density
- High Traffic Density
|
Basic Types of Traffic Signals | - Fixed time
- Traffic Actuated Controllers
|
Types of Detectors | - Impulse Detectors
- Presence Detectors
|
Types of Actuated Signals Control | - Semi Actuated Signals
- Fully Actuated Signals
|
Communication Systems | - Communication with motorists
- Communication with field personnel
- Future development
|
Types of ramp metering | - Platoon-Breakup Metering
- Demand-Capacity Metering
- Gap-Acceptance Metering
|