Transurban Group (ASX:TCL) said its group average daily traffic (ADT) for the March quarter increased by 1.8% from a year earlier, averaging 2.5 million trips per day, helped by traffic growth in all regions, except Queensland, due to impacts from Cyclone Alfred, according to a Thursday Australian bourse filing.

ADT increased the fastest in the company's North America business, which recorded a 3.8% growth to 152,000 trips from a year earlier, the filing said.