bus lane with intermittent priority graham carey pe., aicp brt project engineer, lane transit...
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Bus Lane with Intermittent Priority
Graham Carey PE., AICPBRT Project Engineer,Lane Transit District,
Eugene, OregonQUALITY TRANSIT -- NOW
2009 International Bus Roadeo2009 International Bus Roadeo
Bus Lane with Intermittent Priority Concept• BLIMP
• BLIP
• Dynamic Freeway
• Moving Bus lane
• Virtual Bus lane
• Intermittent Bus lane
• Adaptive Bus lane…….
• Exclusive bus lane provided when bus is present
• BLIMP lane controlled with
Bus Lane with Intermittent Priority Concept
Overhead Lane-Use Control SignalsIn-Pavement Lights
Features
BLIMP Concept
Bus detection
Signal
BLIMP lane
BLIMP Start
BLIMP End
Lane-use control signals
= Lane open to general purpose traffic
= Lane open to bus only
In-PavementLights
All lanes open
BLIMP Concept
BLIMP Start
BLIMP End
Bus approaches BLIMP lane
BLIMP Concept
• Approaching bus detected• Lane-use control signals change• In-pavement lights flash
BLIMP Start
BLIMP End
General purpose traffic exits BLIMP lane
BLIMP Concept
BLIMP Start
BLIMP End
Bus enters cleared BLIMP lane
BLIMP Concept
BLIMP Start
BLIMP End
Bus travels along BLIMP lane
BLIMP Concept
BLIMP Start
BLIMP End
• Lane reopens to general purpose traffic after bus travels through each block
Where has it been applied• University Avenue, Lisbon, Portugal
• Toorak Avenue, Melbourne, Australia
Dynamic Freeway, Melbourne, AU
University Avenue,Lisbon, Portugal
Lisbon
Corridor Modeled
Base Scenarios Tested• Mixed-flow, no special treatment
• Transit signal priority
• BLIMP lane
• Exclusive bus lane
Sensitivity Analyses• Driveway egress control
• Left-hand BLIMP lane
• Lagging queue jump
• Increased traffic volume
• Reduced driveway volume
Preliminary Results
Key Benefits• Bus travel time reduced
• Bus schedule reliability improved
• Exclusive bus lane provided only when needed!
• Strategy fits within existing right-of-way
• Existing property access maintained
Key Challenges• Public information/education campaign is required
• Requires driver compliance
• Enforcement may be needed
Conclusion• Successfully modeled BLIMP lane operations
• BLIMP lane provides benefit of exclusive lane without cost and impact
• Applicability where right-of-way is limited
• Balance can be found between transit benefits + traffic impacts
• Need for real-world pilot application
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