The Most Congested Cities in the World: Why the Answer Depends on How You Measure Traffic

Updated for 2026 readers: If you search for the world’s most congested city, you will see different answers. One ranking says Istanbul. Another points to London. TomTom’s live traffic tools may highlight Mexico City, Lima, Dublin, Bengaluru or London depending on whether you measure congestion level, travel time, speed or hours lost.

That is not a contradiction. It is a measurement problem.

The fairest answer is this: Istanbul was the world’s most congested city by annual hours lost in INRIX’s 2024 Global Traffic Scorecard, with drivers losing 105 hours to congestion. But London remains one of the world’s slowest major cities for short car trips, and Mexico City often ranks worse when the question is how much traffic slows journeys compared with free-flow conditions.

This guide explains the rankings, the hidden methodology behind them, and why a city can feel unbearable to drive through even when it does not top every global list.

Quick answer: the world’s most congested cities by hours lost

The most useful global benchmark for “time wasted in traffic” is the INRIX 2024 Global Traffic Scorecard, which ranked nearly 1,000 cities across 37 countries. By that measure, these were the ten worst cities for congestion in 2024:

Rank	City	Country	Hours lost to congestion	What the ranking means
1	Istanbul	Turkey	105 hours	Worst global delay burden by INRIX’s hours-lost measure
2	New York City	United States	102 hours	High downtown demand, bridge and tunnel bottlenecks, and dense commuter flows
3	Chicago	United States	102 hours	Major commuter corridors and freight-heavy road networks
4	London	United Kingdom	101 hours	Europe’s worst city by INRIX delay hours
5	Mexico City	Mexico	97 hours	Large metro population, road-space pressure, and uneven public transport integration
6	Paris	France	97 hours	Dense central street network and high regional commuter pressure
7	Cape Town	South Africa	94 hours	Regional commuting, limited alternatives for many routes, and peak-hour road pressure
8	Jakarta	Indonesia	89 hours	Megacity traffic with heavy dependence on road-based movement
9	Los Angeles	United States	88 hours	Car-dependent urban form and long cross-city journeys
10	Brisbane	Australia	84 hours	Australia’s worst performer in the INRIX 2024 top ten

Why different traffic rankings give different winners

Most “world’s worst traffic” articles skip the most important detail: congestion is not one thing. There are at least four different ways to measure it.

Metric	What it measures	Best for answering	Weakness
Hours lost	Extra time drivers lose because roads are slower than expected	“Where do drivers waste the most time?”	Can favour big commuter economies with many trips
Average time for 10 km (6.2 miles)	How long a standard short urban car journey takes	“Which cities are slowest to drive through?”	Slow historic streets can rank badly even outside peak congestion
Congestion level	How much longer journeys take compared with free-flow conditions	“Where does traffic add the biggest penalty?”	Can make already-fast cities look better and structurally slow cities look different
Average speed	How fast vehicles move across the network	“Where does driving feel slowest?”	Does not always separate design speed from traffic delay

That is why INRIX can rank Istanbul first by hours lost, while TomTom may highlight different cities when users sort by average travel time, congestion level or rush-hour speed.

1. Istanbul, Turkey

INRIX rank: 1st globally
Hours lost: 105 hours

Istanbul’s traffic problem is partly geographic. The city sits across Europe and Asia, with intense cross-Bosphorus movement funnelled through limited bridge and tunnel corridors. That creates a very different congestion pattern from a grid city such as Chicago or Manhattan.

A 2025 academic PDF on transport justice in Istanbul notes that the city’s congestion creates wider costs beyond delay, including emissions from brakes, tyres and exhaust systems. A separate Istanbul urban mobility report highlighted the role of ferries and sea buses in reducing pressure on Bosphorus crossings, where vehicle traffic is extremely high.

Information-gain takeaway: Istanbul is not just “busy.” It is a bottleneck city. Its worst traffic comes from constrained crossings and uneven integration between road, rail, ferry and feeder systems.

2. New York City, United States

INRIX rank: 2nd globally
Hours lost: 102 hours

New York’s congestion is shaped by its job density and geography. Manhattan, Brooklyn, Queens, the Bronx, New Jersey and Long Island all feed into a limited number of bridges, tunnels and expressways. Even when the subway carries millions of trips, cars, taxis, freight vans, buses and ride-hailing vehicles still compete for a small amount of curb and road space.

The important distinction is that New York is not necessarily the slowest city for every short trip. It ranks badly because so many high-value, high-frequency trips converge on constrained corridors.

Information-gain takeaway: New York’s congestion is less about one bad road and more about access pressure into dense commercial districts.

3. Chicago, United States

INRIX rank: 3rd globally
Hours lost: 102 hours

Chicago tied New York on delay hours in INRIX’s 2024 ranking. Its congestion problem is different: the city is both a commuter hub and a freight hub. That means private vehicles, regional commuters, trucks and service traffic all share critical corridors.

For travellers, Chicago traffic is especially painful when airport journeys, downtown events and expressway peaks overlap.

Information-gain takeaway: Chicago’s traffic burden is amplified by freight and regional movement, not just commuter cars.

4. London, United Kingdom

INRIX rank: 4th globally
Hours lost: 101 hours
TomTom 2025 travel time: 36 minutes 22 seconds for 10 km (6.2 miles)
TomTom 2025 rush-hour speed: 14.1 km/h (8.8 mph)

London is one of the clearest examples of why traffic rankings need context. According to TomTom’s London traffic page, a 10 km (6.2 miles) drive in London averaged 36 minutes 22 seconds in 2025, while rush-hour traffic averaged only 14.1 km/h (8.8 mph).

But London is not simply slow because “too many cars” appear at rush hour. A London Assembly road-space report states that the Mayor’s Transport Strategy attributes 75% of congestion to excessive demand for limited street space, and says traffic management alone cannot solve it.

There is also a structural reason London performs badly on short car journeys: many central roads are old, narrow, signal-heavy and shared with buses, taxis, freight, cyclists, pedestrians and deliveries. In other words, London can be slow even when it is not experiencing a dramatic traffic spike.

Information-gain takeaway: London is not just congested. It is structurally slow. That means “fixing traffic lights” will not produce a city-wide solution unless road-space demand changes too.

5. Mexico City, Mexico

INRIX rank: 5th globally
Hours lost: 97 hours

Mexico City often looks worse in congestion-level rankings than in pure hours-lost rankings. TomTom’s 2025 Traffic Index material highlights Mexico City as a major congestion outlier when journey times are compared with free-flow conditions.

A 2025 ITDP PDF on Mexico City’s mobility integration explains that the city’s mobility strategy has focused on electric vehicles, public transport integration, redistribution of road space for transit and active mobility, and more sustainable transport planning. That matters because Mexico City’s congestion is not just about road volume; it is also about how well different transport systems connect.

Information-gain takeaway: Mexico City’s problem is not only that roads are crowded. It is that disconnected transport systems can force too many trips back onto already overloaded corridors.

6. Paris, France

INRIX rank: 6th globally
Hours lost: 97 hours

Paris is another city where historic design, road-space reallocation and commuter pressure collide. The city has deliberately shifted more space toward walking, cycling and public transport, which can improve urban life while making some car trips slower.

This is why ranking Paris purely as a “bad traffic city” misses the point. For drivers, congestion is costly. For visitors, the practical question is different: can you avoid driving altogether? In Paris, the answer is usually yes.

Information-gain takeaway: Paris shows the difference between a bad city for driving and a bad city for mobility. Those are not always the same thing.

7. Cape Town, South Africa

INRIX rank: 7th globally
Hours lost: 94 hours

Cape Town’s position in the global top ten is important because many traffic articles over-focus on Europe, North America and Asia. Cape Town’s congestion reflects long commuting distances, unequal access to jobs and transport, and heavy pressure on key approach roads.

For visitors, congestion is most relevant when travelling between the city bowl, the airport, the southern suburbs and major tourist areas. Distances that look short on a map can take much longer during commuter peaks.

Information-gain takeaway: Cape Town’s congestion is closely tied to spatial inequality and long-distance commuting patterns, not just tourist-season traffic.

8. Jakarta, Indonesia

INRIX rank: 8th globally
Hours lost: 89 hours

Jakarta has long been associated with severe road congestion, although public transport investment has changed how some trips are made. The city’s challenge is scale: a vast metro area, intense commuter flows and heavy dependence on road movement.

The key point for readers is that Jakarta’s ranking can change depending on whether the source measures central-city delay, regional travel time or commuter hours lost.

Information-gain takeaway: Jakarta is a megacity congestion case where improvements in mass transit can reduce pressure, but road demand remains enormous.

9. Los Angeles, United States

INRIX rank: 9th globally
Hours lost: 88 hours

Los Angeles traffic is different from London or Istanbul because it is spread across a huge car-oriented region. The worst trips are often long cross-region journeys rather than short central-city bottlenecks.

That is why Los Angeles can feel worse than its global rank suggests. A driver may not be crawling through a historic core at 14 km/h (8.8 mph), but they may be trapped on a freeway for a much longer distance.

Information-gain takeaway: Los Angeles is not always the slowest city per kilometre or mile. It is punishing because everyday journeys are long and car-dependent.

10. Brisbane, Australia

INRIX rank: 10th globally
Hours lost: 84 hours

Brisbane’s appearance in the global top ten is notable because it is not usually grouped with Istanbul, New York, London or Jakarta in casual discussions of traffic. But INRIX’s delay-hours measure shows that congestion is not only a megacity problem.

With the city preparing for the 2032 Olympic Games, Brisbane’s traffic ranking is more than an inconvenience. It is a transport-readiness warning.

Information-gain takeaway: Brisbane shows how fast-growing cities can develop world-class congestion before they are perceived internationally as megacities.

Why TomTom may show a different top city

TomTom’s Traffic Index is extremely useful, but it is not the same as INRIX. TomTom uses large-scale movement data and lets readers compare cities by several indicators, including average travel time, congestion level, average speed and rush-hour performance.

TomTom’s 2025 Traffic Index press release says the index covered 500 cities across 62 countries and used data from more than 700 billion km (450 billion miles) driven in 2024. That makes it one of the broadest public traffic datasets available.

The catch is that TomTom answers a slightly different question. It can tell you how long a standard 10 km (6.2 miles) trip takes, how much slower a city is than free-flow traffic, or how far a car can travel in 15 minutes. Those are not the same as annual hours lost.

The hidden difference: slow cities vs congested cities

A city can be slow without being the most congested in the dynamic sense. London is the best example. Its roads are narrow, heavily signalled and shared by many users. That produces slow travel even when traffic is not dramatically worse than normal.

A city can also be fast in free-flow conditions but terrible when traffic hits. That kind of city may score badly on congestion level because the difference between normal traffic and free-flow traffic is so large.

This is the simplest way to understand the rankings:

INRIX hours lost: best for measuring wasted driver time.
TomTom 10 km (6.2 miles) travel time: best for measuring how slow a short city drive feels.

TomTom congestion level: best for measuring how much traffic worsens journeys compared with free-flow conditions.
Local transport reports: best for explaining why the congestion exists.

What drivers and travellers should actually do with this information

For travellers, the “most congested city” ranking is less useful than knowing how to avoid the worst journeys. In nearly every city on this list, the same rules apply:

Do not plan airport transfers during the morning or evening peak unless you have a large buffer.
Use rail, metro, tram, ferry or bus rapid transit for the long part of the trip, then walk or take a short ride for the final 1–3 km (0.6–1.9 miles).
Avoid cross-city car journeys between 7am and 10am, and again between 4pm and 7pm.

Check whether the city’s worst traffic is central, orbital, bridge-based, tunnel-based or event-driven.
In cities such as London, Paris and New York, do not rent a car unless you are leaving the city.

Local evidence: what forums and transport reports reveal that rankings miss

Global datasets are useful, but they flatten local experience. Local forums, PDFs and transport committee documents often reveal why traffic feels worse than the headline number.

For example, Dublin drivers and bus users frequently complain that bus lanes end suddenly, buses merge back into car traffic, delivery vans block bus lanes, and public transport still gets trapped in congestion. That kind of detail rarely appears in a global ranking, but it explains why a city with a smaller population can feel disproportionately congested.

London’s official road-space material makes a similar point at policy level: if too much demand is competing for limited street space, the problem cannot be solved by signal tweaks alone.

In Istanbul, academic and mobility planning PDFs point toward a geography problem: the Bosphorus creates strategic chokepoints, making ferry, rail and feeder integration unusually important.

In Mexico City, transport integration documents show that the challenge is not simply road capacity. It is whether public transport, walking, cycling, electric mobility and road-space allocation work together well enough to reduce forced car dependence.

So, what is the most congested city in the world?

If the question means “where did drivers lose the most time in 2024?”, the answer is Istanbul, according to INRIX.

If the question means “where are short car trips painfully slow?”, London remains one of the strongest candidates, with TomTom reporting an average 10 km (6.2 miles) travel time of 36 minutes 22 seconds in 2025.

If the question means “where does traffic add the biggest penalty compared with free-flow conditions?”, cities such as Mexico City may rank worse depending on the TomTom metric selected.

The better conclusion is this: there is no single world traffic champion unless the metric is stated clearly. Istanbul loses on hours wasted. London loses on urban driving speed. Mexico City loses on traffic impact. Dublin, Lima, Bengaluru and other cities can rise sharply when the ranking focuses on rush-hour delay or standardized commute loss.

Methodology used for this article

This article does not combine rankings into a made-up score. Instead, it separates the main traffic questions:

Primary global ranking: INRIX 2024 Global Traffic Scorecard, using annual hours lost to congestion.
Travel-time and speed context: TomTom Traffic Index, including 10 km (6.2 miles) travel time, congestion level and rush-hour speed.
Local explanation: transport authority material, city mobility PDFs, academic papers, and local forum discussions where they reveal causes not visible in headline rankings.

The limitation is that every traffic index depends on data coverage, city boundary definitions, commuting assumptions, peak-hour definitions and the type of trips being measured. A city can move up or down depending on whether the ranking measures delay, speed, congestion percentage, travel time or commuter cost.