2.Installations for Traffic Control 2)Traffic lights in tunnels with emergency call provisions 3)Traffic guide equipment 4)Traffic census 5)Height control to catch over-sized vehicles 6)Video-monitoring 7)Modern sensors provide warnings to make traffic slow down 百年同濟 8 TONGILUNIVERSITY 8 2. Installations for Traffic Control 2) Traffic lights in tunnels with emergency call provisions 3) Traffic guide equipment 4) Traffic census 5) Height control to catch over-sized vehicles 6) Video-monitoring 7) Modern sensors provide warnings to make traffic slow down