The company wants to become the leading technology supplier for London's congestion-charge scheme, which is set to expand westwards next February.
Q-Free is using the agency's ICT (information and communication technology) arm to handle media relations, lobbying and public awareness work.
K&R won the retained business after working with Q-Free on a three-month project earlier this year, aiming to position Q-Free as ‘an innovative transport-charging company'.
The organisation is developing a ‘smart-card' system that would allow drivers to automatically pay the C-charge from their car and use the same card on buses and trains (similar to the Oyster card currently in use throughout the London transport network).
It is hoped the card could also be used to pay for parking and petrol. K&R will target residential and transport organisations, local and central government and lobbying groups.
Congestion charging is becoming an increasingly popular method of curtailing traffic gridlock in cities worldwide.
Q-Free, which is listed on the Oslo Stock Exchange in Norway, has installed the congestion-charging technology in Stockholm, Sweden.
Its payment systems have also been used in countries such as Chile and Croatia.