* Pavement markings in connection with the surveys.
2020 is a group set up by county councillors, Llangollen Town Council, the Chamber of Trade and the Welsh Government to search for solutions to traffic flow and parking in the centre of town.
Information on the project's Facebook page posted earlier this afternoon says: "An update below from Denbighshire Highways regarding surveying work for the Llangollen 2020 project.
"Final plans have not been confirmed but these surveys by DCC Highways will allow for realistic costs to be developed, so a promising step forward.
"There are still many opportunities for residents to input into and discuss the proposed plans, with the work not likely to be carried out until early 2021."
The post adds: "Please note that in Llangollen we have temporary traffic signals in place on the A5/Market Street junction, A5/Castle Street junction and the A539 Mill Street/Castle Street junctions tonight (Friday) and tomorrow (Saturday) night from 8pm-6am to carry out utility surveys (GPR). Next week from Tuesday to Thursday the surveys continue on the other streets within the centre during the same hours but not under temporary signals.”