Climate campaign group Extinction Rebellion says it will press ahead with a demonstration on the Amsterdam A10 ring road on Saturday at midday, despite being banned from accessing the highway by mayor Femke Halsema.

ER wants to block the ring road next to the location of a former ING office in protest at the bank’s continued investment in fossil fuels. “We are going to do what we planned,” spokesman Let de Jong told the Parool.

“We will begin on the grass embankment then several dozen of us will move to the motorway barrier,” De Jong said. “That will create a dangerous situation and the traffic will have to be diverted.”

The location, on the south of the city next to the office complex known as “the shoe”, is where the A4 motorway joins the A10 and is six lanes wide. The speed limit is 100 kph.

City officials say the motorway cannot be considered a proper location for a demonstration. “It is irresponsible and dangerous,” a spokesman for the city and police said. “We call on the demonstrators not to take risks and to use the alternative location, on the grass next to the building.”

Some 1,100 people are members of the Telegram group where the protest has been planned and ER expects around one third of them will show up. Thousands of people showed up for the protests on the A12 motorway in The Hague earlier this year.

ING said earlier this month it plans to phase out the financing of upstream oil and gas activities by 2040 and triple new financing for renewable energy by 2025.