# Presentation: 831501

## Intersections & Interchanges

- Improved Traffic Signal Control
- Ramp metering
- Intersection Collision Avoidance Systems
- Automated Enforcement

## Improved Traffic Signal Control

*Purpose:  *Reduce signal-related congestion, delay, & crashes
*Description:  *Sensors &  control equipment enable timing to adjust based on conditions, and to be coordinated with adjacent jurisdictions to smooth flow

## Improved Traffic Signal Control

*Example:* Phoenix - Improved Signal Coordination
- 21 signals along corridor within two jurisdictions
- 3 signals adjusted - moved the break in progression  southward
- Improved travel speeds
- Reduced average number of stops
- Resulted in 6.7% reduction in crash risk

## Pedestrians & Bicycles

- Pedestrian Detectors
- In-Pavement Lighting
- Countdown Signal Heads
- Animated Eyes Display
- Bicycle-Actuated Signals

## Pedestrian Presence Detectors

*Purpose:*  Improve safety at pedestrian crossings by accommodating those who need more time
*Description:*  Sensors detect pedestrians waiting or crossing, extend signal phase accordingly

## Pedestrian Presence Detectors

*	**Example:* In-Pavement Lighting
- Amber lights embedded in pavement facing oncoming traffic
- Pedestrian activates system – push button or automated detection
- Lights flash at a constant rate warning motorists that a pedestrian is ahead
- Increases driver awareness of pedestrians

## Highway-Rail Grade Crossings

- Second Train Warning Systems
- Enforcement Systems
- Information Dissemination Systems
- Traffic Signal Control

## Second Train Warning

*Purpose:  *Reduce dangerous driver & pedestrian behavior when crossing is used for  trains in rapid succession

*Description:*  Signs notify drivers and pedestrians that barriers remain lowered due to a “second train coming”

## Second Train Warning

*Example:* Light Rail Transit Grade Crossing
- 26% reduction of vehicles crossing tracks between trains
- Decrease in drivers moving their vehicles under the rising crossing gate before realizing there was a second train

## Road Weather

- Environmental Sensor Stations
- Mobile Sensors
- Information Dissemination
- Treatment Strategies
- Traffic Signal Control
- Variable Speed Limits

## Road Weather Management

*Purpose: *mitigate the effects of rain, snow, ice, fog, high winds, flooding, tornadoes, hurricanes, & avalanches

*Description:  ***Advisory**, **control**, & **treatment** strategies to promote safe travel under adverse weather conditions

## Road Weather Management

- 	Example: Warning System in Ft. Lauderdale
- Warns of wet pavement on a ramp
- Uses in-pavement sensors
- Activates flashing beacons on sign at ramp entrance
- Significant reduction in speeds during wet pavement conditions

## Work Zones

- Portable Traffic Management Systems
- Traveler Information Systems
- Speed Enforcement & Display Systems
- VMS Merge Point Notification

## Portable Traffic Management Systems

*Purpose: *Improve safety by increasing driver awareness of traffic conditions in work zones

*Description: *Collect, process, & display work zone traffic information to the road user

## Portable Traffic Management Systems

*Example:* Minnesota Work Zone
- Video Traffic Surveillance
- Traffic Control Center located at the area TMC
- VMS
- Wireless communication between components
- Variability of speeds decreased 70% within the work zone
- Speeds approaching work zone decreased by 9 mph