I-84 Baker Valley Variable Speed Limit System Lessons learned Intelligent Transportation System June, 2017

Baker Valley VSL System overview

ATM Overview Congestion and weather responsive systems operate simultaneously with slower speed conditions taking priority.

Signs and Messages These photos are just examples. Please replace photos with your own.

Monitoring Equipment Each RWIS location is comprised of a pavement sensor, air temperature/relative humidity sensor, traffic sensor, and a camera.

DSC/DST-111 Pavement Sensors Temperature sensors and cameras are added to all pavement sensor locations to validate readings.

Baker Valley ATM Operations November 2016 - April 2017 Segment Override Count Weather Reduction Count Hours with Speed Reduction I-84 EB Baker (286.50-295.65) 56 106 551 I-84 EB Clover (277.47-286.50) 87 139 752 I-84 EB Medical (295.65-306.40) 62 149 577 I-84 WB Baker (295.42-285.00) 55 104 568 I-84 WB Clover (285.00-277.47) 91 150 775 I-84 WB Medical (306.40-295.42) 61 115 561

Project Design Criteria These photos are just examples. Please replace photos with your own. No guardrail to avoid snow drifts. All structures outside the clear zone. Signs over the travel lanes vs. roadside for traffic & snowplow operations.

Maintainability Minimize parts in sign housing LED board replacement requires lane closure

DSC/DST-111 Pavement Sensors Pavement sensors experience loss of signal during low visibility conditions and report “Other” for grip factor and visibility.

ATM Changes

DSC/DST-111 Pavement Sensors Snow covers only one lane causing a difference of pavement friction from one lane to the next.

ATM System averaged on ramp speeds with mainline Traffic Module Baker Valley Rest Area On Ramp ATM System averaged on ramp speeds with mainline Lower average speeds caused speed reduction on signs

Planned Baker Valley Changes Adding additional DSC/DST-111 sensors to monitor the A lane. Adding camera with IR emitter. Relocating DSC/DST-111 sensors half a mile at the request of the District to detect weather more representative of the corridor. Adding guardrail to protect the sign structures at the request of the Region Manager.

Baker Valley System ATM Configuration

ATM Changes The weather response condition table was increased to incorporate all possible sensor threshold combinations. Rest area on-ramp lane was removed from the sensor collection to stop speed reductions in ATM congestion response. The signs were initially configured to default to 70 or Trucks 65 during communication outages. Changed to default to blank. Pavement condition “Other” added to weather response condition table due to visibility issue.

ATM Changes Adding a second threshold for grip factor and visibility. Adding additional speed reduction tables to address two pavement sensors at the same location.

Concept of Operations Changes OAR requires STE approved VSL algorithm. The weather response speed lookup tables were updated to incorporate the air temperature threshold and “Other” surface condition.

Concept of Operations Changes These photos are just examples. Please replace photos with your own. Speed lookup tables were updated with graphics of the sign renderings. The manual override speed conditions and responses table was updated to incorporate the 70 MPH speed zones.

Concept of Operations Changes

Concept of Operations Changes

Concept of Operations Changes

Concept of Operations Changes

Manual Operation

Manual Operation

Law Enforcement Coordination New section title slide option 1

Law Enforcement New section title slide option 1

CAD Integration

Mt Hood Advisory Speed System Joint project with Region 1 and 4. Project started 2014. Design started before Baker Valley VSL project. Design delayed due to USFS permitting and visual impact concerns.

Mt Hood Advisory Speed System

US97 Variable Speed Limit System These photos are just examples. Please replace photos with your own.

I-84 Snow Zone Safety Improvements New section title slide option 1

DSC/DST-111 Shorter beam and steeper angle is needed to reduce loss of signal condition during low visibility conditions. ITS needs to develop long term contract solution for grip factor sensors.

Visibility ITS is considering using traditional forward scattering optical sensor for visibility instead of DSC-111. Comparison testing for next winter. Agenda slide option 2

Structures ITS is working with Traffic HQ to update VMS standard drawings for monotube cantilever, similar to Colorado DOT.

Thank you.