Fourteen MEPs have signed a letter to EU Transport Commissioner Violeta Bulc demanding the European Commission propose legislation to impose new tolls on trucks. 

There is currently no CO2 standard for trucks in Europe, although cars and vans' CO2 emissions are limited. European Commission data shows trucks contribute one quarter of CO2 emissions from road transport in the EU, although campaigners estimate the figure to be higher. 

MEPs who signed the letter to Bulc want trucks to shoulder more responsibility for the environmental harm they do. One request from the group of MEPs is a toll system that varies costs based on trucks' CO2 emissions or energy efficiency.