The Planning Department in Saint John's City Hall is currently planning to widen a portion of Union Street to four lanes to accommodate better flow of automobile traffic.
There is an ongoing debate in North America between those who believe we need to build our cities to move automobiles as effectively as possible, such as Seattle attempted to do after referendums in the early 70s, and those who believe cities should be built with a focus on pedestrian use supported by effective public transit options as Vancouver attempted to do after similar referendums in the early 70s. It would be wise to investigate which of those two cities were successful and if their citizens are pleased with the outcomes.
The
image below shows a walkable district of Vancouver, a city whose "highways" are no larger than 4 lanes, its blocks are short, its developers feature a property's proximity to transit and walkability factors at the top of their list, and its largest infrastructure investments are in public transportation:

The
image below shows Seattle with its 16 lane highways built at approximately the same time that Vancouver made a conscious decision not to plan its city for the free flow of cars but to build it to encourage people to live close to where they work. In Vancouver, the result is a city that has inspired a movement positively referred to as "
Vancouverism" whose principles are being emulated in cities such as Chicago, Manhattan, and San Francisco.

This article from the southern USA features this debate in the city of Charlotte:
http://www.charlotte.com/someck/story/387324.html. There is plenty of information captured on the topic through this organization:
http://www.walkableamerica.org/Uptown Saint John is currently considered a very walkable city and other communities, such as Portland, Oregon, have actually designed their downtown areas with smaller than normal city blocks modeled after cities like Saint John to improve walkability.
To be sure, to a certain extent, walkability does come at the expense of traffic flow. However, there is a choice to be made either in favour of quality of life for the people and families who live in the city (currently 8000 in Saint John's south end with hopes to double that through the current boom) or in favour of ease of transport for those who visit it.
Articles related to this topic:
- (Brisbane, AU) Make way for foot traffic - "Renewal of suburban centres is likely to require a return to much older and more sustainable principles of urban design, architecture and transport in coming years."