The main entrance into Cote-Saint-Luc, a city of 30 000 inhabitants surrounded on all sides by train-tracks is through the Cavendish underpass. This underpass was constructed in the 1960s. Since then its capacity has long been reached due to several factors. Firstly, there has been much construction of new Condo buildings along and beside Cavendish, and secondly there has been increase car usage since that time period. Most of the traffic that goes through the underpass ends up in the left turning lane, which heads towards fleet and eventually Decarie. In the morning rush hour, the left lane is clogged up for several hundred meters. To help this longstanding problem, the city has decided to restructure the interchange and add an extra left turning lane. It is not so clear how much benefit the extra lane will have in the long term. It is possible that the smoother flowing traffic will just get backed up anyways a few kilometers later as it approaches Decarie. In addition, there are thousands of new potential housing units planned for Cote-Saint-Luc, particularly in the redevelopment of the Cavendish mall complex. If these units share similar driving patterns, it will not be long before the backlogs reoccur with two lanes. Perhaps what is needed is not a second left turning lane, but more public transit to encourage people to leave their cars at home.