Photo: NZ Transport Agency Waka Kotahi
Emergency services were called to the crash on the Rakaia Overbridge, between Main Rakaia Rd and North Rakaia Rd, about 8.40am on Monday.
Hato Hone St John sent an ambulance and operations manager to the crash.
A St John spokesperson told chrislynchmedia.com they assessed and treated a person at the scene with minor injuries, while another patient was taken to Ashburton Hospital in a moderate condition.
A NZ Transport Agency Waka Kotahi spokesperson said the road reopened about 12.35pm.
Police warned motorists to "expect delays while the scene is cleared".
