Tunnel entrance rockfall countermeasure considering environment

Rockfall countermeasure work at Suzuka Tunnel in Second Meishin Expressway in Mie Prefecture
* Embankment height (m): 3.5 * Approximate construction extension (m): 35
* Rockfall diameter (m): D = 1.0 * Converted fall height (m): H = 40.0
* Rockfall energy (kJ): E = 544