LCQ18: Review of the bus-only lane arrangement on Tuen Mun Road
***************************************************************
Question:
The Transport Department's arrangement of designating a bus-only lane (BOL) on Tuen Mun Road (TMR) between So Kwun Wat and Sham Tseng Interchange (TMRBOL) has been in place for over 30 years. Some members of the public have relayed that, following the commissioning of the Tuen Mun-Chek Lap Kok Tunnel in December 2020 and the Government's takeover of the Tai Lam Tunnel in May 2025, the authorities should review the overall traffic conditions on TMR and make adjustments accordingly. In this connection, will the Government inform this Council:
(1) given that in its reply to a question raised by a Member of this Council on June 4, 2025, the Government indicated that in light of changes in traffic flow and bus operation of TMR after the implementation of new toll plans at the Tai Lam Tunnel, the Transport Department would review the arrangement of TMRBOL in a timely manner, of the current progress of the review (e.g. whether the length and operating hours of the BOL will be shortened), and whether it has plans to conduct a comprehensive review of the overall traffic conditions on TMR; if so, of the specific plans; if not, the reasons for that;
(2) as the current design of TMRBOL is inconsistent with those in other districts in Hong Kong (e.g. on major roads such as Nathan Road and Hennessy Road) (generally speaking, where a road exit is located outside a BOL, continuous broken lines or arrow markings are usually provided before the exit to facilitate safe lane changes by vehicles), whether the authorities will review the design of the roads associated with TMRBOL and add continuous broken lines or arrow markings to accommodate the needs of drivers heading to Siu Lam and Sham Tseng; if so, of the specific plans; if not, the reasons for that; and
(3) as some members of the public have relayed that the authorities' arrangement of BOLs in various locations across the territory has caused impacts on other lanes of the same road sections and adjoining roads, leading to traffic congestion or tailbacks, whether the authorities will conduct a study on the impact of BOLs in various districts on traffic and adjust the arrangement of BOLs across the territory in light of the actual circumstances; if so, of the specific plans; if not, the reasons for that?
Reply:
President,
Under the policy of giving priority to public transportation, the Transport Department (TD) has implemented Bus-only Lanes (BOLs) to give buses with high carrying capacity priority in road usage. This helps reduce delays caused by traffic congestion and encourages the public to choose convenient public transportation for travel. BOLs (including bus lanes and designated bus gates), as mentioned in the question, are traffic lanes designated for use only by "franchised buses" or by both "franchised and non-franchised buses" during prescribed times. My response to the question raised by Professor the Hon Lau Chi-pang is as follows:
(1) Following the Government's takeover of the Tai Lam Tunnel on May 31, 2025, and the subsequent reduction in tolls, traffic flow through the tunnel has increased. According to preliminary data, and in line with the Government's expectations, traffic flow on the relevant section of Tuen Mun Road has decreased during weekday peak hours. However, it still exceeds road capacity, resulting in congestion. To balance the needs of different road users and ensure smooth public transport services, the TD considers it necessary to maintain the existing BOL arrangement. Specifically, the left lane of Tuen Mun Road (towards Kowloon), between Harrow International School Hong Kong and the Sham Tseng Interchange, will remain designated as a BOL from 7.30am to 9am (excluding public holidays).
(2) The current BOL arrangements help maintain stable travel times and service levels for franchised buses, thereby encouraging more members of the public to use bus services. This, in turn, reduces the use of Tuen Mun Road by other vehicles with lower passenger capacity and helps alleviate heavy traffic congestion on the road.
Outside the designated BOL operating hours, vehicles traveling along Tuen Mun Road towards Kowloon may use the BOL (leftmost lane) and access Castle Peak Road - Tai Lam Section and Sham Tseng Section via Exits 22 and 23, respectively, in accordance with the guidance provided on directional signs and the deceleration lanes before the exits, depending on travel needs. If the morning peak BOL arrangement is cancelled, the operational efficiency of bus services may be affected, and other drivers may be drawn to use Tuen Mun Road during the morning peak, which would further exacerbate congestion. To remind motorists of the BOL arrangements, appropriate road signs have been installed along the road.
As for other BOL locations, such as Nathan Road and Hennessy Road, these junctions are generally more densely concentrated. Taking into account the travel needs of other vehicles and the availability of alternative routes, the length of BOL setups on these roads is typically shorter. Continuous dotted lines or arrow markings are provided at appropriate locations to allow other vehicles to safely merge at relevant junctions, turn into side streets, or access nearby buildings, thereby supporting the operational needs of the road network.
(3) The current BOL arrangements across Hong Kong have been designed with careful consideration of actual road and traffic conditions, including road and junction design, the number of traffic lanes, the number and frequency of bus routes, traffic volumes of other vehicles, the availability of alternative routes, and the impact on vehicle movement. The TD will continue to closely monitor the operation of BOLs in all districts, as well as prevailing road and traffic conditions, and will optimise the arrangements as necessary. This ensures an appropriate balance under the policy of giving priority to public transportation, thereby supporting the smooth operation of the transport network.
Ends/Wednesday, March 18, 2026
Issued at HKT 12:15
Issued at HKT 12:15
NNNN