CASA0029 | Group 18

CASA0029 Urban Data Visualisation

Stuck in Transit

Understanding Bus Delays in Manchester

This project investigates bus delay and reliability across Greater Manchester, asking where delays occur, how they vary across the network, and how unreliable service may shape everyday mobility.

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Why Manchester, and why bus matters

Greater Manchester is a major bus market within the North West of England. This overview sets the macro context for why bus reliability matters, before the analysis moves into accessibility, delay, and uneven mobility across Greater Manchester.

Macro context

Bus journeys across selected English city-regions

Passenger journeys on local bus services, 2010–2025

Greater Manchester West Midlands West Yorkshire Merseyside South Yorkshire
Year: 2025
Scope note. The chart compares selected combined authorities and city-regions. It does not represent all English regions.

Source: Department for Transport bus statistics.

33%

of daily trips are by bus

1 in 3

residents do not have access to a car

100k+

people are outside a 10-minute walk of frequent bus service

Key point

Bus reliability matters most where people depend on it for everyday access.

Who uses the bus?

Buses are used across many groups, but dependency is uneven. Some people rely on buses more because they have fewer transport alternatives.

Key insight

Bus reliability matters most where people depend on buses for access to education, work, services, and everyday mobility.

Young people use buses more

Share of trips by bus

17–20
15%
21–29
11%
30–49
7%
50–69
6%
70+
5%

Source: TRADS 2024 / transport evidence reports.

Why this matters

01
Access to education

Bus services connect young people to schools, colleges, universities, and training.

02
Access to work

Many jobs are difficult to reach by walking or cycling alone.

03
Affordability

Public transport is often the more affordable option for everyday travel.

04
Connecting communities

Buses link neighbourhoods to services, town centres, and opportunities.

Research Questions

The analysis moves from locating delay patterns to understanding where unreliable service may overlap with social and spatial vulnerability.

Where are delays concentrated?

We first locate delay hotspots across the bus network to understand where unreliable service is most visible within Greater Manchester.

How this study works

The project connects transport accessibility, bus reliability, delay exposure, and uneven mobility into one analytical workflow.

01 Accessibility

Where can people reach?

→
02 Reliability

How dependable is the service?

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03 Delay Patterns

Where and when does delay occur?

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04 Uneven Mobility

Who may experience greater burden?

Accessibility & Bus Network Context

This section situates the bus network within the broader public transport system of Greater Manchester and introduces the spatial structure of accessibility that frames the subsequent delay analysis.

Manchester Transport Context

Greater Manchester is a polycentric city-region of approximately 2.8 million residents distributed across ten metropolitan boroughs (Bolton, Bury, Manchester, Oldham, Rochdale, Salford, Stockport, Tameside, Trafford, and Wigan). Its public transport system rests on three transport modes. A dense bus network carries the majority of trips, the Metrolink light rail radiates outward from the city centre, and heavy rail connects the wider region. Because buses carry the largest share of journeys, their reliability strongly conditions the extent to which residents can access employment, services, and amenities.

The map below visualises Greater Manchester Accessibility Levels (GMAL), the standard accessibility measure adopted by Transport for Greater Manchester. For each grid cell across the region, the GMAL methodology combines walking distance to nearby stops and stations with the frequency of services serving them, producing a composite score that ranges from 1 (very low access) to 8 (excellent). Taller columns and bluer hues therefore indicate locations from which more destinations can be reached, more frequently, within walking distance.

The comparison between 2016 and 2026 is significant because the bus network is being restructured during this period. Under the Bee Network reforms, Greater Manchester became the first English city-region outside London to return its bus services to public control, ending the deregulated regime that had operated since 1986. Switching between years reveals where service density has increased, decreased, or remained broadly stable. The metric controls isolate the contributions of bus, rail, Metrolink, and Local Link services, and clicking any borough zooms the view to examine how accessibility varies at finer spatial scales.

Macro-Level Accessibility Map

Ming: map2 will render here

Borough-level GMAL Comparison (2016 vs 2026)

The 3D map captures spatial detail at the grid-cell scale, but the wider structural change is easier to read once values are aggregated to the ten metropolitan boroughs. The heatmap below summarises the mean GMAL score for each borough across the five accessibility components, comparing 2016 against 2026 side by side. Each row corresponds to one local authority, sorted from highest to lowest 2016 overall accessibility. Within each metric, the two columns share a common colour scale, so darker blue indicates higher accessibility and a clear lightening between columns marks a decline over the decade.

Loading borough comparison…
What the heatmap shows
  • Manchester is distinctly differentiated from other boroughs. Its GMAL score is approximately three times higher than the next-ranked borough in both years, indicating the strong spatial concentration of bus, rail, and Metrolink services within the urban core of the Greater Manchester.
  • Across the region, accessibility declines universally between 2016 and 2026, with an average reduction of around 20%. The steepest proportional losses occur in Bury, Bolton, and Oldham, indicating a widening disparity between core and peripheral areas.
  • This contraction is primarily bus-driven. Bus accessibility falls in all ten boroughs, while rail accessibility improves in most, most notably in Stockport and Bolton, partially offsetting losses but not reversing the overall trend. Contributions from Metrolink and Local Link remain limited outside the central area, reinforcing their secondary role in the wider network.
  • Peripheral boroughs are disproportionately affected. Areas such as Wigan, Rochdale, and Oldham combine low initial accessibility with limited rail or Metrolink alternatives, meaning reductions in bus provision translate almost directly into diminished overall reach.

Key Takeaway

The accessibility layer reveals a transport geography that is both structurally uneven and visibly weakening. Public transport reach concentrates heavily on the central core, where Manchester's overall GMAL score runs around three times higher than that of any other borough in both 2016 and 2026. The outer boroughs of Wigan, Rochdale and Oldham anchor the bottom of the distribution, where limited rail and Metrolink provision leaves the bus network as the principal channel of access.

Comparing the two years, every borough loses overall accessibility, with an average decline of approximately twenty per cent. The fall is driven almost entirely by reductions in bus scores, and the modest rail gains visible in Stockport and Bolton offset only a fraction of the borough-wide loss. The combined picture frames the analytical question that follows. If the bus network is both the dominant mode of access across Greater Manchester and the component most exposed to decline, then its day-to-day reliability becomes the central determinant of how much of the city its residents can actually reach.

Delay & Reliability Dashboard

This dashboard examines the day-to-day performance of the Greater Manchester bus network. It identifies where services operate close to scheduled times, where they consistently arrive late, and how reliability varies across the morning peak, midday, and evening periods. Users can locate a specific route or stop to inspect its typical delay profile, and the heatmap overlay surfaces the neighbourhoods that experience the most pronounced delays at a network-wide scale.

Coverage. The dashboard reports bus services only and excludes Metrolink and coach operations. It covers 265 of the approximately 1,000 (route, direction) pairs operating in Greater Manchester. Lines with insufficient recorded arrivals during the observation window are filtered from the analysis. These include school-only trips, infrequent or demand-responsive services, rail-replacement runs, and routes that began or ended part-way through the window. Such services do not yield delay statistics robust enough to be compared against high-frequency lines. Each direction is reported separately because the same route number frequently follows different roads outbound and inbound.

Network Mean Delay
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Worst Route
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Best Route
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Network Overview & Route Drill-down

Use the search box to look up a route number or a specific stop, or click a route directly on the map or in the sidebar ranking to open its full route detail, including stop-level scatter, weekday vs. weekend heatmap, and a direction toggle.

Loading delay dashboard…

A few routes worth a look

Several lines stand out across the 265 (route, direction) pairs covered here. Click any of the route numbers below in the ranking sidebar, or search for them in the box above, to inspect them stop by stop.

  • Routes 33, 389 and 396 sit near the bottom of the ranking, with median delays of around five to six minutes. That means roughly half of every arrival on these lines is at least five minutes late.
  • Route 632 sits at the opposite end and actually runs a touch ahead of schedule on average, the only line in the dataset that consistently arrives early.
  • Route 7 illustrates how much direction matters. It carries a 4.0 minute median in one direction but only 1.7 minutes in the other, which is why the dashboard now treats each direction as its own record.

Key Takeaway

A clear core-periphery gradient structures the network’s reliability. Median delay remains between one and two minutes across central Manchester and Salford, where dense overlapping services and short feeder distances allow rapid recovery from disruption. By contrast, it rises consistently into the four-to-six minute range across the outer districts of Oldham, Rochdale, Bury and Wigan, where long peripheral corridors and limited parallel provision afford little slack for late vehicles to regain time.

The temporal slicing reinforces this geography. Services perform best during the AM off-peak, with a network-wide median delay of only 1.1 minutes, reflecting low congestion across most of Greater Manchester. The few exceptions — Blackley in Manchester, Hazel Grove in Stockport, and Partington in Salford — are isolated rather than systemic.

Performance deteriorates noticeably in the AM peak, concentrated along the peripheral corridors feeding the urban core, including Farnworth, Rochdale, Shaw, Oldham, Ashton-under-Lyne, Marple, Cheadle Hulme, Partington and Irlam, with a further pocket of delay on the north-western edge of Wigan. This pattern is consistent with directional inbound congestion as commuter flows converge on the city centre. Conditions degrade further through the midday and PM peak, when elevated delays extend across the wider region and are most pronounced on the outskirts, before partially recovering in the late afternoon.

Across the network, only 78 of 265 (route, direction) pairs achieve on-time arrival more than 30% of the time at the source feed’s strict ±1 minute tolerance, indicating that low-grade lateness is the network’s default condition rather than its exception. The peripheral districts least well served by the existing accessibility geography are also those where arrivals are least predictable, a coincidence that motivates the subsequent analysis of how unreliability may be distributed in relation to socioeconomic vulnerability.

Impact / Uneven Mobility

This section explores how delay exposure may be experienced unevenly across Manchester and situates bus reliability within a wider socioeconomic context.

Section Framing

Bus delays are not just an inconvenience, they can have real implications for accessibility to jobs, opportunity, and essential services. This section explores how delay exposure may be unevenly distributed across Greater Manchester and how this relates to the dispersion of socioeconimic deprivation across the metropolitan area.

Mobility Implications

Jacob: commute delay / travel time loss / accessibility burden content goes here

Socioeconomic Context

Jacob: deprivation / vulnerability / socioeconomic background goes here

Overlay / Comparison Map

Jacob: choropleth / overlay map showing uneven exposure goes here

Key Takeaway

Delay exposure is not evenly distributed across Manchester. Some areas, especially in areas further from the city center such as Bolton, Middleton, Oldham, and Stockport, experience much higher average delays than others and tend to be more socioeconomically deprived, suggesting that bus delays may be exacerbating existing inequalities in accessibility and opportunity across the city. This spatial overlap does not directly indicate direct causality, but it does suggest that lower-quality service and delays may be disproportionally affecting those who are most reliant on public transport and currently face harsher socioeconomic circumstances. Longer wait and communte times and less reliable transport can lower access to critical services in opportunity in employment, education, and healthcare, further reinforcing some communities already in an disadvantaged socioeconomic position. Given these patterns, transportation investments and service improvements should be strategically directed to serve these areas to enhance reliability, reduce delay exposure, and increase overall acessibility in underseved communities, opening the door for more equitable access to opportunity across Greater Manchester. Therefore, improving the performance of the transport system can contribute to a more efficient and equitable city with more equal opportunity for all residents, regardless of where they live or their socioeconomic background.

Conclusion

This project has investigated bus delay and reliability across Greater Manchester, asking where delays occur, how they vary across the network, and how unreliable service may shape everyday mobility. The analysis connects transport accessibility, bus reliability, delay exposure, and uneven mobility into one analytical workflow.

Final Thoughts

A contracting network with uneven losses. Across the three layers of analysis, a consistent picture emerges. Bus accessibility in Greater Manchester has contracted by roughly 20% between 2016 and 2026, with the steepest losses concentrated in peripheral boroughs such as Wigan, Rochdale, and Oldham, precisely the places where rail and Metrolink alternatives are weakest.

A more nuanced delay and deprivation pattern. Delay exposure layered onto this shows a more nuanced pattern than a simple deprivation gradient. Most of Greater Manchester's deprived neighbourhoods sit in central Manchester, where service is frequent and delays are low, and at the regional scale the correlation between delay and deprivation is effectively zero.

Where the burden actually lands. Yet two distinct clusters, five to six LSOAs each in Rochdale and Bolton, combine both high delay and high deprivation, the kind of localised overlap that a city-wide average would obscure entirely. The headline is therefore not that unreliability uniformly punishes the most deprived, but that its burden is geographically concentrated in specific peripheral places, where contracting bus provision and weak alternative modes meet socioeconomic vulnerability. The Bee Network reforms create an opportunity to address these clusters directly, if reliability gains can be targeted rather than averaged across the network.

Why interactive visualisation matters here. This kind of finding is precisely why interactive visualisation matters. A 129,000-cell accessibility grid, 265 route-direction pairs, and stop-level delay distributions across five time bands together represent the kind of multi-scalar, multi-dimensional dataset that resists a single chart or headline figure, and, as the deprivation analysis shows, a system-wide statistic can flatten exactly the spatial detail that carries the policy signal.

From dataset to public exploration. By letting users toggle between years, switch between bus, rail, and Metrolink components, filter by time of day, and drill from the network down to individual LSOAs and stops, the dashboard turns a dense analytical pipeline into something a general audience can explore on their own terms. The aim is not to deliver a fixed conclusion but to make the underlying complexity legible, so residents, planners, and policymakers can interrogate the network at the spatial and temporal scale that matters to them, and locate the specific neighbourhoods where targeted intervention would do the most good.

About

A · Project Summary

Project Summary

Stuck in Transit is an interactive data-visualisation project that explores bus delays and reliability across Greater Manchester. Built for CASA0029 (Urban Data Visualisation) by Group 18, the website guides you through how the city's bus network has changed between 2016 and 2026, where services run late most often, and how unreliable buses can quietly reshape daily life, especially for residents without access to a car. Through maps, charts, and a searchable route-level dashboard, you can compare accessibility across the ten boroughs, drill into specific routes and stops, and see where delay exposure overlaps with socioeconomic deprivation. The aim isn't to deliver a single headline figure, but to let residents, planners, and policymakers explore the network at the scale that matters to them and pinpoint the neighbourhoods where better reliability would do the most good.

D · Limitations

Limitations

The delay analysis draws on Bus Open Data Service (BODS) real-time feeds from a single ten-day window (18–27 June 2025), so it captures a snapshot rather than a long-run average. Seasonal effects, school holidays, roadworks, special events, and year-on-year network changes are not represented, and routes with too few recorded arrivals in the window are excluded, meaning roughly 265 of ~1,000 (route, direction) pairs are reported. Delay figures are aggregated medians and percentiles, which describe typical conditions but cannot capture how any individual passenger experiences a missed connection or a long wait. The causes of lateness are also not directly observable: congestion, signal priority, driver shortages, and other operational disruptions all sit behind the numbers. Finally, the accessibility (GMAL) and deprivation (IoD) layers come from different years and spatial units, so overlaps between them should be read carefully.

Meet the team

Jacob Echele

Email

jacob.echele.25@ucl.ac.uk

Kongtup Wanichjaroenporn

Email

kongtup.wanichjaroenporn.22@ucl.ac.uk

Piyapa Sotthiwat

Email

piyapa.sotthiwat.25@ucl.ac.uk