There's been mass taxi demonstrations, thousands of social media comments posted in protest - and now... a sheep and a pony on the 471 bus.
The bizarre spectacle was the latest show of opposition against Greater Manchester's proposed Clean Air Zone (CAZ).
There are plans to introduce charges for some vehicles deemed high emitters from May this year.
READ MORE: Greater Manchester bosses want talks to pause the introduction of Clean Air Zone
Proposals for a daily charge of between £7 and £60 for vans or pickups, taxis and private hire cars has created a tide of opposition from operators and small businesses fearing they will be forced off the road by 'impossible' demands to upgrade vehicles.
The plan could now be put on hold following a backlash.
Shepherdess Jade Hutchinson, from Radcliffe, Bury, has her own objections.
She says many livestock owners and farmers will see the cost of caring for their animals dramatically rise because of the CAZ.
Jade, 22, took Derbyshire Gritstone Colin on the 471 Diamond Bus - which travels between Bolton and Bury - to protest the plan.
They were joined by others opposing the plan, including a Shetland pony called Ernie and its owner.
"The event was to create awareness of the impact the CAZ will cause, not only to the public and businesses, but the animals that rely on it," Jade, who trades livestock, told the Manchester Evening News.
"The vehicles that do not comply are widely used by farmers, animal shelters, equestrians and so on. They're required to tend to the animals, feed them, check them and take them to the vets.
"The CAZ will devastate non-profit organisations that rely on these vehicles."
Jade added: "There are approximately 32 yards, farms and small holdings within a five-mile radius of Bradley Fold, where I demonstrated. Each one will be affected.
"They may not be big farms, but they still mean so much to our country behind the scenes."
There was a simple - obvious - message at the heart of the protest, Jade said, highlighting that many people and businesses cannot rely on public transport.
She added: "The demonstration proved our point as a separate bus was organised. It is not possible for businesses to turn to public transport."
The journey lasted just five minutes and was held near the animals' homes, so they were not distressed.
