One person has died and another critically injured after a car crashed on Milton Highway in Clutha this morning.

Police were called to the crash at 9.20am.

State Highway 1 is down to one lane north of Patterson Rd while the Serious Crash Unit investigates.

NZTA said a stop/go was in place and motorists should expect some delays.

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Meanwhile, a truck and van collided about 9.20am on West Coast Rd in Yaldhurst, Christchurch today.

Road blocks were in place at the intersection of West Coast Rd and Old West Coast Rd, and Hasketts Rd and West Coast Rd.

Emergency services are still at the crash and the roads will be blocked while power lines are fixed.