Chrissy Ames can prescribe drugs, stitch wounds and refer patients on to other services.
Two people are taken to hospital following a crash between a school coach and a bus that injured 18.
South Central Ambulance Service says it needs to prioritise the sickest patients as demand rises.
The double-crewed ambulances have replaced ageing vehicles in the fleet.
A visit to SCAS control room sees crews making the best of their day over Christmas.
A CQC report says South Central Ambulance Service has made "significant improvements"
The change is being implemented in phases until 2027, the NHS trusts say.
Dorchester Town's Wes Fogden waited an hour for an ambulance after breaking his neck during a match.
South Central Ambulance Service staff will lead the training at almost 100 schools.
