1 - HKU Libraries

T.P.D.M.V.2.6
(Al/2002)
6.43 Chainage Markers
6.4.3.1 On Expressways the designation of specific locations by reference to adjacent property or
local names is either inappropriate or vague, and a more accurate method of fixing location
is necessary in case of carrying out maintenance works or reporting a traffic accident to
police or seeking assistance during an emergency.
6.4.3.2 Therefore each Expressway must be provided with its own individual unified chainage,
which should start at zero at the beginning of the route and be accurately marked in
kilometres along the length of the route. Determination of the zero point for each route
should be made in consultation with the Transport Department. Intermediate points at
100m intervals should also be marked on both sides of the carriageway.
6.4.3.3 Survey reference markers for the unified chainage should be established in the central
reservation at kilometre intervals. These can be used for re-establishing the 100m marks
should they become lost for any reason.
6.4.3.4 A revised design of chainage marker signs is shown in Diagram 6.4.3.1. The revised signs
will be erected on trial at Route 1 Fanling Section in mid-2002. If found satisfactory, the
signs will be installed on other expressways. The chainage marker signs with an x~height of
150mm shall be erected facing the traffic at 1km intervals whilst the supplementary chainage
marker signs with an x-height of 75mm shall be erected parallel to traffic at 100m intervals.
6.4.3.5 The main chainage marker signs erected facing the traffic should be mounted on a free
standing post, 900mm to 1500mm high, set at the back of the shoulder whilst the
supplementary chainage marker signs erected parallel to the traffic should be mounted on
the barrier fences at the central reservation and along the edge of the Expressway or bridge
parapets where these exist.