This Week In Public Transit

Transcript 27 lines

Cold Open Stats Overview Paper Walkthrough free_promo

Cold Open

Jenny When your usual ride disappears, what do you actually do first?

Davis I want to say I calmly open a map, but honestly I do the little commuter panic spiral, then look for whatever still moves.

Jenny Right, and that panic is the whole policy question, because a backup only helps if it's close, visible, and not already full.

Davis That's the hopeful version for me: disruptions expose whether the city planned for ordinary people having a bad morning.

Jenny Because in Montréal in 2025, when public transit went on strike, BIXI rides were eighteen percent higher than on a regular weekday, which is a pretty sharp clue that backup systems aren't a luxury...welcome to This Week In Public Transit on paperboy.fm.

Stats Overview

Davis This week is a real jump: we analyzed 8 results, 7 qualified, with 26 unique authors across 4 countries, Canada, the U.S., Germany, and India. That matters because the theme isn't just more transit papers; it's operations and disruptions reshaping who rides, who works, and what cities become.

Jenny The headline delta is huge, but small-base huge: qualified papers went from 2 last episode to 7 this week, a 250 percent increase. I wouldn't call that a field boom yet; with only 8 query hits, it may mean this week's search caught a broader mix, from strikes to age-friendly transit to bike sharing.

Davis And the query pool itself rose from 6 to 8, about 33 percent, so the big change is relevance, not raw volume. The methods look wide too: one paper separates individual effects from group effects, a multilevel regression; one maps how factors connect, a structural equation model; and the rest include qualitative work, case study, traffic modeling, and simulation.

Jenny Authorship is the other shift: unique authors went from 2 to 26, and the qualified set spans 4 countries. That tells me this isn't one lab dominating the week, though I'd still ask whether one venue or call for papers pulled these topics together.

Davis The author mix is pretty balanced for a small set: 2 authors, or 7.7 percent, are first-time, meaning first-ever paper, not just new to our feed. Fourteen are emerging researchers at 53.8 percent, and 10 are experienced at 38.5 percent.

Jenny The theme sweep fits the through-line: public transit and urban planning each show up twice, then single papers on bicycle sharing, resilience, transportation strikes, elderly mobility, and age-friendly transit. So the practical question is city-sized: when agencies tweak service, face a strike, or design for older riders, who gets mobility and who gets left waiting?

Paper Walkthrough

Paper 1 When public transit stops, bikes roll: Measuring the impacts of public transit strikes on bicycle sharing use in Montréal

Jenny Alright, let's get into the papers with a very literal stress test for transit: Hisham Negm and A. El-geneidy's Findings twenty twenty-six paper, When public transit stops, bikes roll: Measuring the impacts of public transit strikes on bicycle sharing use in Montréal.

Jenny The plain version is simple: when buses and metro service were reduced during two Montréal transit strikes in twenty twenty-five, BIXI bike-share trips went up. The estimate was an eighteen percent increase on strike days compared with a typical weekday when transit was running normally.

Davis How do we know that was actually the strike effect, and not just a sunny day, a normal weekday bump, or people biking more because the neighborhood already had good bike access?

Jenny They tried to separate that out with BIXI trip history, weather, Bike Score, transit infrastructure, and Canadian census data, then modeled trips at an aggregated hexagon level, meaning they broke the city into small map cells instead of only looking citywide. The statistical tool was multilevel regression with crossed random effects, which is basically a way to compare places and days while accounting for the fact that trips cluster by location and time. That's pretty strong evidence for Montréal and BIXI in twenty twenty-five, but it doesn't prove every city's bike-share system can flex the same way.

Davis So the practical takeaway isn't, hey, bikes magically replace the metro. It's that agencies can plan for bike share as part of disruption response, with extra staff and bike redistribution ready when the system is under strain, which fits this bigger thread of transit stress tests.

Paper 2 Traffic light cycles for a sustainable city

Davis After BIXI and strike-day redistribution, here's the quieter version of the same idea: maybe the lever isn't a fleet of bikes, it's a traffic signal cabinet on the corner. The paper is called Traffic light cycles for a sustainable city, by Adamo Cerioli, Riccardo Lucarno, Jiaqi Liang, Guillermo Prieto-Viertel, V. Servedio, and Rafael Prieto-Curiel, in Royal Society Open Science in twenty twenty-six.

Davis Their surprising claim is that giving cars more green time can make driving slower. The model compares driving with walking, cycling, and public transport, and it finds a traffic light paradox, meaning a rule meant to help cars attracts enough extra drivers that congestion eats the benefit.

Jenny What would have to be true inside that simulation before a city should actually retime real intersections around it? Because commuters don't all behave like little travel-time calculators, and one bus route with bad headways can change the whole choice set.

Davis They built a traffic model where commuters adaptively switch to the fastest option until equilibrium, which just means nobody can save time by changing modes. Then they ran grid-based simulations calibrated to realistic urban conditions, including irregular networks and non-linear congestion, but the big caveat is still that it's a model, so the result depends on whether the simulated people and streets really match a city's streets.

Jenny That still feels useful, as long as planners treat it like a test bench, not a prophecy. In the hidden design levers bucket, this is a good one: before spending millions on new infrastructure, try modeling whether a few seconds less car green time nudges trips toward buses, bikes, walking, and that fifteen-minute-city goal.

Paper 3 Reported impacts and workplace needs of transit operators related to passenger drug misuse on transit vehicles

Jenny That test-bench-not-prophecy caveat matters here too, but the frame flips from simulated commuters to the person at the wheel. The paper is Reported impacts and workplace needs of transit operators related to passenger drug misuse on transit vehicles, from Pranav Srikanth and colleagues in twenty twenty-six.

Jenny They interviewed nineteen transit operators in Washington and Oregon, and the plain finding is that passenger drug misuse on vehicles is showing up as a workplace health and safety problem. Operators described physical health effects, mental health strain, emotional fallout, and a feeling that agency support wasn't keeping up.

Davis What can a small interview study tell us clearly, and what should we be careful not to overstate with only nineteen operators in two Pacific Northwest states?

Jenny It can tell us what the hazard feels like from the driver's seat, because the method was qualitative interviews, meaning the authors asked operators for detailed accounts rather than trying to estimate a systemwide rate. The strongest signal is the unmet need for engineering controls, which just means built or technical protections like barriers, ventilation, or vehicle design changes, but the evidence is local and qualitative, so it identifies needs more than it measures how widespread they are.

Davis That lands as a real stress test for transit. If agencies write safety policy only around riders, they miss the worker who has to keep the bus moving for an eight-hour shift, so the practical takeaway is to evaluate operator protections and support systems alongside rider-facing safety rules.