Atlas Arteria has reassured investors it has enough liquidity to get through the COVID-19 pandemic despite traffic on its biggest tollroads tumbling by two thirds in late March.

"The timing for changes to the COVID-19 lockdown arrangements in all Atlas Arteria's markets continues to remain uncertain, but Atlas Arteria and its businesses remain in active engagement with all stakeholders, including debt providers, to enable an appropriate response to changes in circumstances as they arise," the company said on Wednesday.