Sustainable event mobility: which measures really work

Because it is usually one of the largest items in the carbon footprint and the one with the most room for improvement. At UK music festivals, audience travel accounts for 64% of the average footprint, which stands at 15.9 kg CO₂e per person per day (The Show Must Go On, Edition 3, 2026).

An earlier edition (2015) spoke of “up to 80%” at British festivals, mostly camping festivals, and warned that the share varies a lot from one event to another. Another report (CAST and Julie's Bicycle, 2022) sums it up without giving a percentage: for many events, audience travel is one of the biggest contributors, if not the biggest.

These figures come from UK music festivals. We do not transfer them as they stand to an urban arena concert or to a Spanish festival. They do show a pattern that repeats: audiences arrive from many origins, almost always by car, and cover long distances.

There is one more reason to start here. The same 2026 report calculates that a 32% reduction in audience travel emissions, the one achieved at a British concert in 2024, would cut the UK sector's emissions by nearly 20%. It is an order of magnitude of what may be at stake, not a forecast for your event.

A note on control: audience travel is an indirect emission (scope 3 in the scheme used by the British sector). You do not control it directly, but you can influence it with incentives, strategy and access rules, as the onboard:earth guide (2024) points out. That is why this article focuses on measures you can apply and measure.

Emissions per passenger-km depend on the transport mode and on how many people are in the vehicle. The IDAE (Spain's energy agency) table gathers average factors for motorised modes, with the average occupancy it uses to calculate them.

With the average occupancy used by the IDAE (1.2 people), a car emits between 2.4 and 4.1 times more per passenger-km than a bus, a commuter train or a metro (120.7 versus 49.4 for the urban bus and 29.6 for the metro). The electric car emits less than the combustion car, but at that occupancy it is still above the company bus, the intercity bus, commuter rail and the metro.

The table teaches two things. First, the mode matters. Second, occupancy matters: bus and train factors assume reasonably full vehicles, and the car factor assumes barely 1.2 people. A bus with fewer passengers than average emits more per person, and so does a shuttle that returns empty.

Because most cars carry very few people. The European Environment Agency puts average car occupancy at around 1.5 people (EEA, 2020). The Spanish traffic authority (DGT) and the IDAE (2019) report 1.3 people per car on urban trips, with around 80% of vehicles running with the driver alone, and about 1.2 people on access to workplaces.

These are general or commuting figures, not event figures. They are useful for the order of magnitude: with 1.2 to 1.5 people per car, its emissions and its parking space are shared among very few people. The same publication calculates that, at 1.2 people per car, 100 workers need about 85 vehicles, and that at 3 people per vehicle about 35 would be enough.

At British outdoor camping festivals, the 2015 report used 2.6 passengers per car as the industry average (2010-2014 period). Its scenario of raising it to 3.5 passengers meant a saving of 15,407 t of CO₂e, 20% according to the report's table. It also concluded that if 60% of the audience travelled by coach and train and car occupancy for the rest improved from 2.6 to 3.5, the savings would exceed the sector's own operational emissions. Do not extrapolate it to urban events or to Spain: it is an order of magnitude.

The next table is our own calculation based on the IDAE factor: 120.7 g per passenger-km at 1.2 people equals about 144.8 g per car-kilometre (120.7 × 1.2). Shared among more occupants, it looks like this:

Alternatives work when they are more convenient or cheaper than driving, not only more sustainable. Here are the five main ones, with what you can expect from each. The assessment is qualitative: real impact depends on your venue and your audience.

1. Coordinated public transport. It means aligning timetables, frequencies and extra services with the operator (train, metro, bus) to match your entry and exit times, and telling the audience how to get there from each origin.

• Impact: high if the venue is well connected, because each traveller moves to the mode with the lowest emission factor.
• Cost: low for you if the service already exists. Extra services are negotiated with the operator or the council and their cost depends on the agreement.
• Complexity: medium. It requires coordinating with third parties well in advance and checking the last return service.
• When it makes sense: urban venues or venues with a nearby station. It is the base measure of any plan.

2. Shuttles and coaches. Dedicated buses that link the venue with a station, a city centre or agreed pick-up points. They can be last-mile shuttles or coaches from origin cities, sold as single seats or as ticket + transport packages. You will find the full analysis in shuttle buses vs carpooling.

• Impact: high at concentrated origins where they fill up. It depends on real occupancy, including on the return.
• Cost: high. You pay the operator and the fleet, and recover part of it through seat sales.
• Complexity: high. You need to define routes, frequencies, stops, accessibility and coordination with the exit flow.
• When it makes sense: concentrated origins and venues without good public transport. According to the onboard:earth guide (2024), uptake rises when the option is offered at the ticket point of sale; it suggests ticket + transport packages, fast-track entry and dropping passengers close to the gates.

3. Carpooling. Attendees going to the same event from nearby areas share a car and split the costs of the journey. It is organised with a platform, your own board or ticketing groups. To see how much it cuts emissions in each case, see attendee transport emissions.

• Impact: medium, and it grows with occupancy (see the example above). It reaches scattered origins that no line covers.
• Cost: low for the organiser. The driver and passengers split the costs of the journey.
• Complexity: low to medium. The challenge is reaching critical mass: having rides published from each area.
• When it makes sense: scattered demand, peripheral or rural venues and the last mile that collective transport does not cover. It performs better combined with an incentive such as priority parking.

4. Cycling and walking. Secure, supervised bike parking, signposted routes and, at urban venues, clear pedestrian routes from nearby stations and neighbourhoods. Provide lighting and signage for the night-time return.

• Impact: low to medium. They do not emit on the journey, but their weight depends on how many people live within a reasonable distance, and at peri-urban venues it tends to be small.
• Cost: low (bike racks, signage, volunteers).
• Complexity: low.
• When it makes sense: urban venues or venues near population centres. The onboard:earth guide recommends offering secure cycle storage.

5. Nearby accommodation or on-site camping. Agreements with hotels and hostels, or a camping area, for multi-day events or audiences travelling from far away.

• Impact: medium. It avoids daily round trips, although it does not reduce the kilometres of the main journey.
• Cost: medium (agreements and, for camping, infrastructure).
• Complexity: medium.
• When it makes sense: multi-day events or audiences arriving from far away.

Four measures act on the decision to come by car without changing the transport offer: parking, access restrictions, incentives with their communication, and schedules. They are the ones you control most as an organiser.

6. Parking management. You control one of the few direct levers: how many spaces there are, who gets them and how much they cost. Common practices are charging for car access, giving priority (nearby parking or fast entry) to cars with several occupants, surcharging cars that arrive almost empty and requiring a booked space. More detail in how many parking spaces an event needs.

• Impact: high, because it acts on the decision for each trip. The onboard:earth guide cites a report by ACT1.5 and the Tyndall Centre (2023) according to which reducing parking by 20% could lower audience travel emissions by 10% (excluding flights).
• Cost: low. It usually generates revenue.
• Complexity: medium. You need ticketing or access control for the car park and clear rules.
• When it makes sense: when you control the parking and there are credible alternatives. The same guide suggests raising the price if ticket sales are robust. Raising it without alternatives pushes the problem onto nearby streets.

7. Access restrictions. Limiting or closing certain roads to private traffic, reserving lanes for buses, using perimeter park-and-ride or allowing access by reservation only.

• Impact: medium. It forces a change of mode, but can move the problem to other areas.
• Cost: low to medium (signage, staff, fencing).
• Complexity: high. It requires permits and coordination with the council, local police and, where applicable, the DGT or the regional authority.
• When it makes sense: venues with a single saturated access or sensitive residential areas. There is a specific guide on reducing traffic and queues at access points.

8. Incentives and communication. Discounts on tickets or consumption for those who arrive by collective transport, by bike or in a full car; a “how to get here” page ordered by sustainability; messages at ticket purchase and in pre-event emails.

• Impact: medium. The onboard:earth guide states that the best results come at the ticketing stage, and that priority parking or early entry for full cars have worked well.
• Cost: low (discounts and design).
• Complexity: low.
• When it makes sense: always. It is the measure that activates the others, because it makes the offer known.

9. Schedules and staggered exit. Opening doors earlier, spreading headliners, scheduling the exit in blocks, offering post-event activity or coordinating the last transport service with the end of the event.

• Impact: low on emissions, high on congestion and safety. It improves the entry and exit experience, but on its own it does not change mode.
• Cost: low.
• Complexity: medium. It affects programming and production.
• When it makes sense: venues with sharp entry and exit peaks.

No single measure solves the problem. Compared, parking and communication at ticket purchase are the cheapest to activate, and shuttles and access restrictions are the most demanding.

The combination depends on how well connected the venue is and on how concentrated or scattered the audience's origins are. Here are three starting points.

At an urban venue the priority is to take the car out of the equation. At a peripheral one, turn arrival into a few large flows (shuttles) and leave a well-managed remainder of cars. At a rural one, accept that there will be many cars and work on getting them to arrive full and without queues. If you need a broader framework, see the event mobility plan.

A useful plan is built in six steps, from information to measurement, and repeated edition after edition.

1. 1

   Find out where your audience comes from

   Ask your ticketing provider for the postcodes on tickets (and on parking passes if you sell them) and work out distances and concentrations. If you have no data, a pre-event survey is a first approximation.

2. 2

   Set a baseline

   Estimate how many people arrive by each mode, from what average distance and with how many people per car. Without a baseline you cannot show improvement.

3. 3

   Choose measures according to the venue type

   Start from the table by venue type and discard what does not fit your budget or your permits. Prioritise cheap measures with good impact: parking and communication.

4. 4

   Design the offer and the parking policy

   Agree timetables, routes and extra services with operators and the council. Define who parks, how much it costs and what advantage a full car gets.

5. 5

   Communicate at ticket purchase

   Include the alternatives in ticketing, in pre-event emails and on the website, with the how-to-get-here information ordered from most to least sustainable. This is where the decision is still open.

6. 6

   Measure, compare and adjust

   Collect the same data as in the baseline, calculate the indicators and compare them with the previous edition. Keep what works and fix what does not.

You measure with a small set of indicators that are comparable between editions, not with a single CO₂ figure. These are the usual ones:

• Modal split: percentage of the audience arriving by car, public transport, coach or shuttle, bike and on foot.
• Average car occupancy: people per vehicle and percentage of full cars.
• Kilometres travelled: average distance of the audience, return included.
• Audience travel emissions: total and per attendee, with the emission factors and scope documented.
• Use of alternatives: seats sold on shuttles and coaches, bike spaces occupied, carpool rides completed.
• Access experience: entry and exit times, queue length, incidents.

The onboard:earth guide (2024) proposes collecting how people travelled, how many kilometres and, if by car, how many passengers. The data come from ticketing postcodes, surveys during or after the event, counts by volunteers and parking and coach sales.

Define what counts. Travel by artists, crew and suppliers is a separate block from the audience, and it is best measured and reported separately. In Spain you can use the IDAE factors, citing their stated purpose (MOVES programme projects) and the version you consulted. The British guide uses DEFRA factors and notes that they can be used in Europe, although they are based on UK averages. Document which one you use. To place this indicator in your inventory, see the guide on event carbon footprint.

Communicate only what you have measured, with its method, and always distinguish estimates from measurements. A modest, verifiable headline protects your reputation more than a big promise.

• Measured figures, not other people's averages. If you use an external reference, say which one. A British average does not describe your event.
• Methodology in plain view: emission factor, scope (which trips you include and which you do not), data year and how you collected the information.
• Compare with yourself. The previous edition is the valid comparison, always with the same method.
• Reduction and offsetting, separately. Do not subtract offsets from the reduction figure.
• Acknowledge limits. The British guide itself admits gaps in data on audience travel emissions. If your survey sample is small, say so.
• Avoid absolutes. “Neutral event” or “zero emissions” are claims you will hardly be able to sustain.

The most common mistakes are offsetting without reducing, measuring poorly and communicating late. Almost all of them are avoided with a baseline and a clear plan.

• Measuring emissions only. You miss access times, safety, accessibility for people with reduced mobility and nuisance to neighbours.
• Not communicating alternatives, or doing it late. If the audience discovers them on the day of the event, they have already decided.
• Shuttles without studied demand. Routes and schedules that do not match the audience's origins end up almost empty.
• Forgetting the return. A last service before the end or a chaotic exit sends the audience back to the car.
• Using other people's benchmarks as your own result. An average from British festivals is not your event's footprint.
• Having no baseline. Without one you cannot say whether a measure has worked.

We recommend VIB3S as a carpooling solution for events. It is a shared mobility platform: attendees share a car with people going to the same event from their area. They get a free app (iOS and Android) and a web widget from which they see published rides, publish their own and request a seat without downloading anything.

For the organiser, VIB3S builds your event's community inside the app and the widget embeds in your website, ticketing or emails with one line of code. On VIB3S's side it is ready in under 24 hours. It complements public transport and shuttles rather than replacing them, and it fits where demand is scattered and on the last mile.

With completed rides you get your own data to measure your indicators. The CO₂ method is public: CO₂ avoided (kg) = sum, per completed ride, of distance (km) × 0.145 × number of passengers (not counting the driver). 0.145 kg/km is approximately equivalent to the IDAE factor for a car (120.7 g per passenger-km × 1.2 people ≈ 145 g/km).

• Geographic origin of the audience and routes with the most demand
• Arrival and departure time slots
• Average occupancy per vehicle
• Shared kilometres, cars avoided and CO₂ calculated and validated on completed rides