A section of the M62 in Knowsley will be de-illuminated for a 12 month trial by Knowsley Council.
The trial will begin on Friday 8 March between junctions 5 and 6 of the motorway.
The slip roads onto and off the motorway will remain lit as will the gantry signage.
Renewed road markings, reflective studs, and better reflective traffic signs have been installed ahead of the start of the trial.
The impact of the trial will be assessed through analysis of energy efficiencies, financial savings, and survey data over the 12 months.
Any feedback from residents and road users will also be taken into consideration.