Politicians have attacked the "crazy" situation which sees north Watford road signs illuminated all night, while dangerous bends are left in darkness by the streetlight switch-off.
Hertfordshire County Council introduced a part-night lighting scheme in 2011.
The authority has come under increasing pressure for the fact that warning signs are illuminated 24 hours a day, which councillors feel undermine its energy-saving argument for turning out the street lamps.
In response, the council has said it was looking into the inconsistency between streetlights and sign lighting, the Watford Observer reports.
Liberal democrat county councillor for the Nascot and Park division Mark Watkin told the news provider that he understood the times that the hazard lights were illuminated were in line with national guidelines.
He added: "[I] think it is crazy that there is a different policy from the Department of Transport and the country. They should have the light on for the sign and they should have the streetlights on as well."
Since 2011, the Conservative-controlled county council has turned the majority of Hertfordshire's streetlights off between 00:00 and 06:00 as part of a scheme to save up to £1 million a year.
The company contracted to maintain the roads system by the council Ringway has said that it is aware of the inconsistency with the lights and insisted it is working to address this.
Divisional manager at Ringway Matthew Kelley told the news provider that not all the light columns across the county were set up to allow for the county-wide part night lighting scheme, particularly were there are additional signage wiring requirements.
"We are working closely with Hertfordshire County Council to address this at the earliest opportunity," he continued.
The council could look towards energy efficient outdoor wall lights or LEDs to illuminate the streets of the county, as many other authorities have looked into.
Indeed, Sheffield became the first place in the UK to implement city-wide installation of LED streetlights to save money and improver safety in the area last year.
