However, the renovation may cause even more serious congestion of the tunnels and may change the starting time for one-tube-two-way traffic (using one tube only for both direction of traffic) from 12 am to 9 or 10 pm. The fire-resisting shields on the wall of the tunnels and the ceilings would be renovated, while the words LION ROCK TUNNEL and its Chinese counterparts would be retained on the sides of the entrances and exits of the tunnels.