Publications
You can access my Google Scholar profile here.
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Intersections as Barriers to Low-Stress Cycling: Intersection Level of Traffic Stress and Dual-Graph Network Modeling
Journal of Transport Geography
Bicycle network analysis has lacked a method for incorporating intersection crossing stress into routing and accessibility analysis. This paper proposes crossing level of traffic stress (xLTS) criteria for both signalized and unsignalized intersections, merging lanes crossed, traffic volume and speed, crossing islands, and rider characteristics into a gap acceptance model, and introduces a dual-graph network representation so that turning and crossing costs can be modelled directly.
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Intersections as Barriers to Low-Stress Cycling: Intersection Level of Traffic Stress and Dual-Graph Network Modeling
Transportation Research Board (TRB) Annual Meeting
Extends the Level of Traffic Stress (LTS) framework to intersections, introducing intersection-level LTS (xLTS) criteria for signalized and unsignalized crossings and a dual-graph network model to capture turning costs. Applied to job accessibility in Boston, showing how high-stress crossings constrain low-stress bike access even where street segments themselves are low-stress.
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Intersection Level of Traffic Stress: How Much Do Intersections Affect Low-Stress Bike Accessibility?
International Cycling Safety Conference (ICSC 2026)
Extends the Level of Traffic Stress framework to intersection crossings (xLTS 1 to 4) and tests how much crossings add to the barrier created by street segments. In Boston and Montreal, 89% of crossings had the lowest stress, but 1,199 and 814 critical crossings respectively break up low-stress routes. In Boston, the share of jobs reachable on an LTS 1 route falls from 0.9% to 0.2% once crossing stress is counted, and from 12.1% to 10.9% at LTS 2.
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Intersections as Barriers to Low-Stress Cycling: Intersection Level of Traffic Stress and Dual-Graph Network Modeling
Bridging Transportation Researchers (BTR#8) Conference
Extends the Level of Traffic Stress (LTS) framework to intersections, introducing intersection-level LTS (xLTS) criteria for signalized and unsignalized crossings and a dual-graph network model to capture turning costs. Applied to job accessibility in Boston, showing how high-stress crossings constrain low-stress bike access even where street segments themselves are low-stress.
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Why Johnny and Mary Can't Ride to School: Identifying Barriers to Safe Bicycle Access
Boston Area Research Initiative (BARI) Conference
Maps low-stress bike access to six Boston high schools and to jobs across the region. Five key infrastructure projects would greatly expand how many teens can reach some schools on low-stress routes, from about 500 to 3,700 at the John D. O'Bryant School, and the talk points to protected bike lanes on major roads and safer crossings as the way to take down the barriers.
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Community-Engaged Informed Floating Bus Stop Guidelines
Transportation Research Board (TRB) Annual Meeting
Builds floating bus stop guidelines from a review of 20 design guides and studies, focus groups with 21 bus riders with visual, hearing, or mobility impairments, and interviews with practitioners in cities such as Amsterdam, Montreal, and Toronto. Recommends full-width platforms, bike speed management, and crosswalks aligned with boarding areas.
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TSP-Friendly Underlying Traffic Signal Control: An Essential Complement of Transit Signal Priority
Future Transportation
Transit Signal Priority (TSP) can reduce bus delays, but in the U.S., the reductions are often small due to TSP being applied within traffic signal systems not optimized for it. TSP-friendly signal control involves minimizing bus phase red times and adjusting green phases to match bus arrivals. Simulations in Boston showed that combining active TSP with TSP-friendly control reduced bus delay 2.0 to 3.1 times more than applying TSP over existing systems, with delays dropping to under 5 seconds at two sites.
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Design Guidelines for Accessible Floating Bus Stops
ASCE International Conference on Transportation and Development
This paper summarizes global best practices for integrating separated bike lanes with bus stop infrastructure, analyzes bicyclist and transit rider behavior at various floating bus stops to understand their interactions, and develops design guidelines to improve the safety and accessibility of floating bus stops.
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Underlying Traffic Signal Control: The Key to Effective Transit Signal Priority
MassDOT Transportation Innovation Conference
On MBTA Route 39, buses lose an average of 43 s at the Perkins and Bynner Street intersections. Green Extension alone helps little, but paired with TSP-friendly signal timing and intersection layout it cuts bus delay to about 5 s and pedestrian wait by more than 60%, with no added auto delay in PTV Vissim simulations.
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Sign-Aware Attention-Based Multitasking Framework for Integrated Traffic Sign Detection and Retroreflectivity Estimation
Expert Systems with Applications
We propose SAAM-ReflectNet, a deep learning framework that automates traffic sign detection, classification, and retroreflectivity estimation by integrating robust spatial-semantic feature extraction, Sign-Aware Attention, and multimodal fusion of RGB and LiDAR data. Achieving a mean Average Precision (mAP) of 0.635 and RMSEs of 0.169 (foreground) and 0.147 (background), ReflectNet demonstrates scalability and accuracy, making it ideal for large-scale, proactive traffic sign maintenance.
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Accessible Bus Stop Design in the Presence of Bike Lanes
Office of Transportation Planning, Massachusetts Department of Transportation
Floating bus stops, adjacent to bike lanes, require bus passengers to cross the bike lane to board or alight, creating challenges, especially for visually impaired and wheelchair users. This study examined different floating bus stop designs in Greater Boston, analyzing rider behavior and conflicts with bicyclists, and provides design recommendations to improve accessibility and safety.
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Accessible Bus Stop Design in the Presence of Bike Lanes
MassDOT Transportation Innovation Conference
Studies how bus riders and bicyclists interact at floating bus stops, using an inventory of 56 MBTA-area stops, LiDAR trajectories and 360-degree video at five Boston stops, and focus groups with riders with disabilities, to propose design guidance that reduces conflicts.
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Modification of Bitumen with Waste Materials for Enhanced Aggregate Retention in Surface-Dressed Roads
3rd IRF Africa Regional Congress & Exhibition
Raveling, the loss of aggregate from surface dressing, poses significant maintenance challenges and economic burdens for road agencies, especially in developing countries. This study explored the use of locally available waste materials, such as ground-tire rubber (GTR), as sustainable bitumen modifiers to mitigate raveling, finding that GTR-modified bitumen significantly reduces aggregate loss under adverse conditions, making it a viable alternative for improving chip seal performance.