Highway crashes are down, but tunnel crashes are rising: why chain collisions matter
Overall highway crashes fell, but tunnel crashes followed a different path. Yonhap reported, based on data submitted by Korea Expressway Corporation to a National Assembly transport committee member, that accidents on managed highways declined from 2021, while accidents inside tunnels rose. The striking point is that 44.9% of tunnel crashes involved three or more vehicles. In tunnels, where escape space is limited, the key is how quickly a first crash can be contained before it becomes a chain collision.
Key summary
- Accidents on Korea Expressway Corporation-managed highways fell from 1,735 in 2021 to 1,419 last year, down 18.2%.
- During the same period, accidents inside tunnels rose from 109 to 115, up 5.5%.
- Over the past five years, 554 tunnel crashes caused 48 deaths and 371 injuries.
- Crashes involving three or more vehicles accounted for 249 cases, or 44.9% of tunnel accidents.
Confirmed facts
- Yonhap summarized the tunnel crash trend, deaths, injuries and causes based on Korea Expressway Corporation data.
- Gyeongbuk Maeil separately reported the case of Mungyeong 2 Tunnel on the Jungbu Naeryuk Expressway and its high chain-collision count.
- Inattention was the top reported cause of tunnel crashes at 53.4%, followed by drowsiness, insufficient following distance and speeding.
- Speeding crashes inside tunnels were not the largest category by count, but deaths per 100 such crashes were far higher than for speeding crashes on highways overall.
Why tunnel accidents can be more dangerous than the raw count suggests
Inside a tunnel, lane changes and evasive space are limited, and changes in lighting can delay a driver’s recognition of sudden braking ahead. Once a crash happens, following vehicles have less time to understand the situation, and emergency access is more difficult than on open road sections. That is why tunnel safety should be evaluated not only by the number of crashes, but also by chain-collision rates, alert broadcasts, variable message signs, emergency bays and escape-route accessibility.
| Risk factor | Key meaning | What to check |
|---|---|---|
| Chain-collision share | A first crash can quickly pull in following vehicles | Whether spacing and hazard-light warnings are enough |
| Driver inattention | Lighting shifts and monotony overlap in tunnels | Whether navigation or phone checking is stopped |
| Speeding severity | Fatality risk appears high even when case counts are limited | Slowing before entry and respecting limits |
What to watch next
- Watch how far tunnel crash-detection devices and rear-warning systems are expanded.
- Crash-prone tunnels may need a combined approach: speed control, distance warnings and lighting improvements.
- Drivers should reduce speed before entering tunnels and leave more space than usual after entry.
- On long tunnels, planning rest stops or drowsy-driver stops is safer than trying to push through fatigue.
Search keywords
- Korea highway tunnel accidents five years
- tunnel chain collision 44.9 percent
- Mungyeong 2 Tunnel crash data
- tunnel driver inattention accidents