The organiser of Hong Kong Streetathon has admitted that instructions could have been clearer after some half-marathon runners went miles out of their way in Sunday’s event.

Both the half-marathon and full marathon started near the East Coast Park in Causeway Bay and finished at San Shan Road in To Kwa Wan. But half-marathon runners did not have to go through the Tseung Lam Highway.

Andes Leung, CEO and co-founder of RunOurCity Foundation, said around 20 to 30 half-marathon runners accidentally entered the Tseung Kwan O–Lam Tin Tunnel when they should have turned right.

Leung told an RTHK programme on Monday that while the signs were set up correctly, staff could have taken more initiative to instruct runners where to go.

"I'm not saying the organiser can't improve. I think the staff could have been more proactive. They could have reminded runners, face-to-face, that full marathon runners should go straight ahead, while half-marathon runners should turn right. That would have been better," he said.

Leung added that staff training will be improved to prevent similar issues from happening again.