A chain-reaction crash briefly blocked northbound traffic through the Su'ao Tunnel in Yilan, but nobody was hurt.

• Several cars rear-ended each other in the northbound lanes early Monday afternoon.
• Traffic was held up while police worked at the scene.
• The road has since reopened and is flowing normally again.
• No injuries were reported; the cause is still being investigated.

Outlook: Police are expected to determine what triggered the pileup, with no lasting impact on the route.