Work starts on the busiest roads.
A hotline and an online form are available for residents to report problems or send suggestions.
City officials say the project is part of a wider plan to upgrade services and public spaces across the districts.
What the project includes
Work is being carried out in phases to keep disruption to traffic and nearby shops to a minimum.
Residents welcomed the project, which they say will make daily life easier for thousands of families.
Our goal is a cleaner and safer city for every resident.
Local volunteers are also taking part in clean-up and tree-planting campaigns in the area.
The first phase is due to be completed within months, with the rest following before the end of the year.
