Stagecoach is to invest £5.7 million on 31 new buses for Hull.
The new fleet, which includes a mix of single and double deckers, will deliver better air quality, boost capacity and help tackle congestion.
The vehicles will be fitted with environmentally-friendly engines, and up to date CCTV equipment.
Matt Cranwell, managing director of Stagecoach East Midlands, says: "Buses are critical to our region's economy and communities.
"They take people to work, bring customers to our high streets, help young people access education and build new skills, and draw families, friends and communities together.
"We are delighted to make this latest significant investment in Hull's bus network.
"As well as providing better travel for local people, these new vehicles will improve local air quality and help reduce congestion by providing a high quality alternative to the car."