"Police and ambulance attended the incident and the crew member was treated.
"We do not know the extent of their injuries.
"Police are following up on the incident.
"While we understand some people are very stressed by the current [weather] situation, we do ask they follow instructions which are in place for everyone's situation."
Police were investigating the incident, a police spokeswoman said.
The traffic crew worker wasn't seriously injured, she said.
A Wellington Free Ambulance spokeswoman said, "I can confirm that we had one ambulance attend this incident and we transported one patient to hospital in a moderate condition."