Police are appealing for information after a meter reader was found with serious head injuries in Kihikihi, in the Waikato.

Officers are also asking for sightings and footage of two vehicles travelling in the area at the time.

"Emergency services were called to Oliver Street on Thursday, January 5, where a meter reader was found with serious head injuries," says Detective Senior Sergeant Andrew Saunders.

"He remains in a critical condition in hospital."

As part of ongoing inquiries, police are appealing for sightings of two vehicles involved.

One vehicle - a red Daihatsu Terios, registration LKN281 - belonged to the victim, and the other is a silver Nissan Primera, registration DHA220.

Both vehicles are believed to have travelled the route pictured, between Kihikihi and Tihiroa, on the afternoon of January 5 and police are keen for more information about the vehicles' movements.

Police are appealing to anyone who was travelling that route between 4.30pm and 8pm on Thursday, January 5, to come forward.

"We are particularly interested in anyone who may have dash cam footage, or if anyone who lives along that route has CCTV footage that may be of use to Police," says Detective Senior Sergeant Andrew Saunders.

If you can help, please contact Police via our 105 phone service or online at https://www.police.govt.nz/use-105, using Update My Report.

Please reference file number 230105/8487.

Information can also be provided anonymously via Crime Stoppers on 0800 555 111.