17. Traffic Safety - Master Glossary - Traffic Safety - TCRP 183 A Guidebook on Transit-Supportive Roadway Strategies
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Course 6 - Traffic Safety -Master Glossary
Saturday, January 03, 2026 11:27 AM
MODULE 1 — Transit-Supportive Roadway Fundamentals
1. Transit-Supportive Roadway
A roadway designed to improve bus operations, safety, and pedestrian access.
2. Multimodal Corridor
A corridor that accommodates transit, walking, biking, and vehicles. https://www.google.com/search?
3. Roadway Function
The intended role of a roadway (mobility vs. access) shaping transit performance.
4. Transit Priority
Design or operational strategies that give buses an advantage over general traffic.
5. Context-Sensitive Solutions
Roadway designs tailored to surrounding land use and community needs.
6. Mobility Objective
A goal focused on improving movement of people rather than vehicles.
7. Access Objective
A goal focused on improving how easily people reach destinations and transit.
MODULE 2 — Land Use, Urban Form & Transit Demand
1. Transit-Supportive Land Use
Development patterns that increase transit ridership through density and mix.
2. Activity Center
A concentrated area of destinations generating high transit demand. https://www.google.com/search?
3. Density Threshold
The minimum population or job density needed to support frequent transit.
4. Urban Form
The physical layout of streets and buildings influencing transit access. https://www.google.com/search?
5. Street Grid Connectivity
A connected street network that shortens walking distances to transit.
6. Mixed-Use Development
Development combining residential, commercial, and civic uses. https://www.google.com/search?
7. Pedestrian-Oriented Design
Design that prioritizes walking comfort, safety, and access to transit. https://www.google.com/search?
MODULE 3 — Roadway Design for Transit Operations
1. Curbside Management
Allocation of curb space for buses, loading, parking, and pedestrian needs.
2. Bus Lane
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A dedicated lane reserved for transit vehicles to improve reliability. https://www.google.com/search?
3. Queue Jump
A short bus-only lane allowing buses to bypass traffic at intersections. https://www.google.com/search?
4. Transit Signal Priority (TSP)
Signal timing adjustments that reduce bus delay at intersections. https://www.google.com/search?
5. Road Diet
A roadway reconfiguration that reallocates space to transit, bikes, or pedestrians.
6. Access Management
Controlling driveway and intersection spacing to improve safety and transit flow.
7. Lane Reallocation
Shifting roadway space from general traffic to transit or multimodal uses.
MODULE 4 — Pedestrian Access, Safety & Connectivity
1. Pedestrian Access Route
A continuous, safe path connecting origins to transit stops. https://www.google.com/search?
2. Crossing Opportunity
A safe, convenient location for pedestrians to cross a roadway. https://www.google.com/search?
3. Exposure Risk
The amount of time pedestrians spend in conflict with moving traffic. https://www.google.com/search?
4. Mid-Block Crossing
A crossing placed between intersections to match pedestrian desire lines.
5. Refuge Island
A protected median space allowing pedestrians to cross in two stages. https://www.google.com/search?
6. Sidewalk Continuity
The uninterrupted presence of sidewalks enabling safe transit access. https://www.google.com/search?
7. Curb Ramp
A sloped transition between sidewalk and street for accessible crossings.
MODULE 5 — Transit Stop Placement & Roadway Integration
1. Near-Side Stop
A bus stop located before an intersection, often increasing turning conflicts.
2. Far-Side Stop
A stop placed after an intersection to reduce conflicts and improve visibility.
3. Mid-Block Stop
A stop positioned between intersections to improve access or reduce congestion.
4. Stop Spacing
The distance between bus stops, affecting travel time and safety. https://www.google.com/search?
5. Boarding Area
A firm, level space where passengers safely board and alight. https://www.google.com/search?
6. Sight Distance
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The length of roadway visible to a driver, affecting reaction time. https://www.google.com/search?
7. Access Shed
The area from which riders can reasonably walk to a bus stop. https://www.google.com/search?
BATCH 2 — MODULES 6–10
TCRP 183 — 7 Key Words per Module with Definitions + Image Search URLs
MODULE 6 — Transit Operations, Reliability & Delay Reduction
1. Transit Delay
Time lost due to congestion, signals, or roadway design that slows bus movement.
2. Running Time
The total time a bus takes to travel between two points, including delays.
3. Reliability Index
A measure of how consistently buses arrive on time. https://www.google.com/search?
4. Bottleneck
A roadway location where congestion or geometry restricts bus movement.
5. Dwell Time
The time a bus spends stopped for boarding and alighting. https://www.google.com/search?
6. Transit Travel Time Savings
The reduction in travel time achieved through roadway or operational improvements.
7. Delay Hotspot
A specific location where recurring delays significantly affect bus performance.
MODULE 7 — Transit Signal Priority & Intersection Strategies
1. Transit Signal Priority (TSP)
Signal timing adjustments that reduce bus delay at intersections. https://www.google.com/search?
2. Signal Phase
A portion of the signal cycle assigned to a specific movement (e.g., through, left).
3. Queue Jump Lane
A short bus-only lane allowing buses to bypass queued traffic at intersections.
4. Early Green
A TSP strategy that gives buses a green light earlier than general traffic.
5. Green Extension
A TSP strategy that extends the green phase to allow a bus to clear the intersection.
6. Signal Cycle Length
The total time required for a traffic signal to complete all phases. https://www.google.com/search?
7. Intersection Delay
Time lost by buses due to red lights or turning conflicts. https://www.google.com/search?
MODULE 8 — Roadway Cross-Section Design & Transit Priority
1. Cross-Section
The arrangement of lanes, medians, sidewalks, and buffers across a roadway.
2. Dedicated Bus Lane
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A lane reserved exclusively for buses to improve speed and reliability. https://www.google.com/search?
3. Shoulder Running
Allowing buses to operate on roadway shoulders during congestion. https://www.google.com/search?
4. Median Busway
A transit facility located in the roadway median to reduce conflicts. https://www.google.com/search?
5. Lane Reallocation
Shifting roadway space from general traffic to transit or multimodal uses.
6. Buffered Lane
A lane separated by painted or physical buffers to improve safety. https://www.google.com/search?
7. Road Diet
A reconfiguration that reduces vehicle lanes to create space for transit or bikes.
MODULE 9 — Access Management & Driveway Control
1. Access Management
Controlling driveway and intersection spacing to improve safety and transit flow.
2. Driveway Consolidation
Reducing the number of driveways to minimize conflict points. https://www.google.com/search?
3. Median Control
Using medians to restrict turning movements and reduce conflicts. https://www.google.com/search?
4. Conflict Point
A location where vehicle, bus, or pedestrian paths intersect. https://www.google.com/search?
5. Access Spacing
The distance between driveways or intersections along a corridor. https://www.google.com/search?
6. Turn Restrictions
Limits on turning movements to improve safety and reduce delay. https://www.google.com/search?
7. Corridor Management
Coordinated strategies to improve safety and mobility along a roadway.
MODULE 10 — Transit Performance Measurement & Evaluation
1. Performance Metric
A measurable indicator used to evaluate transit operations. https://www.google.com/search?
2. Travel Time Index
A ratio comparing actual travel time to free-flow travel time. https://www.google.com/search?
3. Reliability Measure
A metric assessing how consistently buses adhere to schedules. https://www.google.com/search?
4. Delay Analysis
A method for identifying sources and patterns of transit delay. https://www.google.com/search?
5. Before-and-After Study
An evaluation comparing conditions before and after a roadway change.
6. Corridor Performance
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The overall efficiency and reliability of transit along a roadway corridor.
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7. Level of Service (LOS)
A measure of roadway or transit performance based on speed and delay.
BATCH 3 — MODULES 11–15
TCRP 183 — 7 Key Words per Module with Definitions + Image Search URLs
MODULE 11 — Safety, Roadway Design & Conflict Reduction
1. Conflict Point
A location where the paths of buses, vehicles, or pedestrians intersect.
2. Crash Modification Factor (CMF)
A value estimating the safety impact of a roadway design change. https://www.google.com/search?
3. Access Spacing
The distance between driveways or intersections to reduce conflicts. https://www.google.com/search?
4. Speed Management Strategy
A roadway design or operational tool used to reduce vehicle speeds. https://www.google.com/search?
5. Sight Distance
The length of roadway visible to a driver, affecting reaction time and safety.
6. Pedestrian Conflict Zone
An area where pedestrian and vehicle movements overlap. https://www.google.com/search?
7. Safety Audit
A structured review of roadway conditions to identify safety risks. https://www.google.com/search?
MODULE 12 — Corridor Planning, Network Integration & Multimodal
Strategy
1. Corridor Vision
A long-term plan describing desired multimodal performance and design.
2. Network Integration
Coordinating transit, pedestrian, and roadway systems for seamless mobility.
3. Multimodal LOS (Level of Service)
A performance measure evaluating roadway conditions for all users. https://www.google.com/search?
4. Mode Share
The percentage of trips made by each travel mode (transit, walking, biking, driving).
5. Corridor Typology
A classification of corridors based on land use, function, and mobility needs.
6. Mobility Objective
A goal focused on improving movement of people rather than vehicles.
7. Access Objective
A goal focused on improving how easily people reach destinations and transit.
MODULE 13 — Implementation, Phasing & Project Delivery
1. Implementation Plan
A structured roadmap for delivering transit-supportive roadway improvements.
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2. Phasing Strategy
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A sequence for delivering improvements over time based on priority and resources.
3. Quick-Build Project
A low-cost, rapid implementation approach using temporary materials.
4. Capital Improvement Program (CIP)
A long-term funding plan for major transportation projects. https://www.google.com/search?
5. Stakeholder Coordination
Collaboration among agencies, communities, and partners during project delivery.
6. Cost-Benefit Assessment
An evaluation comparing project costs to expected benefits. https://www.google.com/search?
7. Performance Tracking
Monitoring project outcomes to ensure goals are met. https://www.google.com/search?
MODULE 14 — Evaluation, Monitoring & Performance Measurement
1. Performance Indicator
A measurable value used to assess transit or roadway outcomes. https://www.google.com/search?
2. Before-and-After Evaluation
A comparison of conditions before and after a roadway improvement. https://www.google.com/search?
3. Data Collection Protocol
A standardized method for gathering performance data. https://www.google.com/search?
4. Reliability Measure
A metric assessing how consistently buses adhere to schedules. https://www.google.com/search?
5. Travel Time Index
A ratio comparing actual travel time to free-flow travel time. https://www.google.com/search?
6. Corridor Performance Dashboard
A tool displaying key performance metrics for a roadway corridor. https://www.google.com/search?
7. Monitoring Cycle
The frequency at which performance data is reviewed. https://www.google.com/search?
MODULE 15 — Equity, Community Engagement & Policy Alignment
1. Equity Lens
A planning approach evaluating how roadway decisions impact different demographic groups.
2. Environmental Justice (EJ)
Ensuring no group bears disproportionate transportation burdens. https://www.google.com/search?
3. Inclusive Engagement
Outreach strategies designed to reach diverse and underserved populations.
4. Community Partnership
Collaboration with residents and organizations to shape roadway improvements.
5. Policy Alignment
Ensuring roadway strategies support local, regional, and state policies.
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6. Access Burden
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The additional time, distance, or risk required for certain groups to reach transit.
7. Equity Performance Measure
A metric evaluating whether improvements benefit underserved communities.
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Bus Stop Safety Table |
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