The lawyers claimed Cambridgeshire County Council made an "irrational" decision when funding his care.
Cambridgeshire County Council (CCC) said cyclists and walkers should keep off the track on Thursday.
Cambridgeshire County Council previously funded the position at Crosshall Infant School in St Neots.
The Conservatives have retained the leadership of Cambridgeshire County Council, despite losing their overall majority in this month's election.
Cambridgeshire County Council leader Nick Clarke said local councils and businesses had to help the government fund the project.
Bus-only tunnels under Cambridge are a "realistic" possibility if funds are won from the government, according to Cambridgeshire county council's leader.
Cambridgeshire County Council said its original contractor had left the route from St Ives to Cambridge with a number of "major defects".
It has left Cambridgeshire County Council with a problem of dealing with waste and has also hit its record of recycling 57% of waste.
BBC: Cambridgeshire composter breakdown costs ?60,000 a week
Mark Miller, from Cambridgeshire County Council, said the gritters will be out in force treating major routes but minor roads may still be hazardous.
BBC: Cambridgeshire Police warn of ice patches on some roads
It was expected to open in spring 2009, but has been beset by delays and financial disputes between Cambridgeshire County Council and its original contractor BAM Nuttall Ltd.
East Cambridgeshire District Council is talking to the county police force about monitoring the Ely and Soham CCTV from Ely Police Station.
Suffolk County Council's cabinet meets next Tuesday, while the Cambridgeshire and Peterborough Fire Authority's next meeting is on 24 May.
The Cambridgeshire and Peterborough Campaign to Protect Rural England (CPRE) said the county council's plans for Ely needed to be reconsidered.
Wisbech 2020 Vision is a joint county council and Fenland District Council project, backed by North East Cambridgeshire MP Stephen Barclay.
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