The future of a junction where three people died in a crash remains unclear.
The local highways authority says it has installed additional signs at the Bluntisham site.
The council had turned down planning for the waste incinerator, but the government overruled this.
Cambridgeshire County Council says it made a "reasonable decision" when it initially refused plans.
A firm's proposal to build a clinical waste incinerator is being reviewed by the Planning Inspectorate.
Cambridgeshire authority cites the effect on the landscape and perceived health risks for decision.
