Unverified50% confidenceFactExact time
In ultra-long highway tunnels, cross passages are usually set every 250 to 500 meters, connecting the main tunnel with a parallel pilot tunnel or adjacent tunnel tubes.
1
Sources
50%
Confidence
Long-term
Relevance
10/12/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedThe 150-kilometer tunnel scale far exceeds the total of all projects The Boring Company has built to date.67% similarUnverifiedThe Boring Company plans to dig a tunnel network exceeding 150 kilometers within the UAE.65% similarUnverifiedUltra-long highway tunnels usually adopt a scheme combining longitudinal ventilation and transverse ventilation, and are equipped with real-time air quality monitoring systems.65% similarUnverifiedThe one-way toll for the Mont Blanc Tunnel at the Franco-Italian border is approximately 60 euros.60% similar
Cite This Claim
Stable URI
https://kongchang.com/claim/1011919API
curl https://kongchang.com/api/v1/knowledge/claims/1011919MCP
get_claim(id=1011919)