Toll roads operator Transurban collected more than $1 billion in tolls in six months as traffic surged on its Sydney, Melbourne and Brisbane motorways, driving a 42 per cent jump in its half year net profit.

Chief executive Scott Charlton said a rise in the number of vehicles on Transurban’s roads in the six months to December reflected the company’s investments in improving the network’s efficiency, and the experience for customers. Tolls for trucks also continue to rise at a faster rate than car tolls, though…