European Union Transport Commissioner Violeta Bulc called for the introduction of a standardised European-wide road pricing system in comments she made to a German Sunday newspaper.
Bulc said there were many different systems in Europe at the moment and this was a burden on car drivers and an obstacle to their mobility.
Germany plans to introduce a controversial road toll in 2016 aimed at foreign drivers using Germany's Autobahn motorways. German drivers would also pay the toll, but would be compensated with a reduction in existing automobile taxes. The government and the EU are embroiled in a dispute about whether this is compatible with EU law.
Ahead of a planned visit to Berlin this week, Bulc told Welt am Sonntag it would make sense, in the medium term, to work on a European system for lorries and cars that could regulate road charges in a uniform manner for all EU countries.
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"The amount of the fee should, in my opinion, be exclusively based on the number of kilometres actually driven and should not be time-dependent," she was quoted as saying.
"It doesn't matter where you come from - everyone will only pay for the distance they have actually driven and it will be billed on a device throughout Europe. We're currently investigating just such an idea."
>>Read: Germany's new road toll to cost foreign drivers up to 130 euros
Bulc did not say whether all EU states would be required to introduce a car toll related to distance travelled.
"There are many options - a fee could be obligatory but it's also possible to make it optional i.e. that countries decide themselves whether and on which roads they want to levy a road use charge based on kilometres driven."
>>Read: Transport expert: EU-wide road toll is quick-fire solution