The East of England Ambulance Service, criticised over poor response times, is to take delivery of 120 new vehicles.
The first will go into service in Norfolk, where cover has been described as poor by health watchdogs.
The aim is to have no ambulances over five years old.
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Sunday forecast: Heavy rain is expected for a time with gusty winds, then clearing during the afternoon.
March in the Anglia region has been much drier and sunnier than normal although temperatures have been around average.
Breezy and rather cloudy overnight but mainly dry. On Sunday, becoming wet and windy for much of the morning after a dry start.