Commuters can expect longer travelling times at seven Circle Line stations from June 11 to July 20

During this period, train services will be adjusted to facilitate maintenance works

LTA said it had set up monitoring instruments in this segment of the Circle Line tunnel to measure "tunnel movement levels"

It found that a small segment of the tunnel between Promenade and Nicoll Highway stations has been subject to “greater pressure”

LTA has not detected a similar issue in other areas