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Maintenance of Road Tunnels

Most of the road tunnels in Hong Kong are parts of strategic key routes subject to heavy traffic volume. It is therefore of utmost importance to upkeep the conditions of the road tunnels in satisfactory working condition and to maintain the durability and serviceability of the road tunnels. In general, maintenance activities of the tunnel tubes can only be carried out during regular tunnel closure when one-tube-two-way operation is implemented lasting for three to five hours at night. Due to this very short duration of time available for maintenance, careful planning in advance is necessary to maximize its efficiency. Road tunnels maintenance activities include regular inspections, repair/resurfacing of carriageway and application of protective coating on reinforced concrete surfaces, etc.