People who regularly walk or cycle across the Macdonald Bridge will have to adjust their schedules starting Sunday night when the pedestrian and bike lanes shut down for the next 18 months.

The planned lane closures are part of The Big Lift re-decking project.

Halifax Harbour Bridges has, in their place, set up a free shuttle service that will operate 24/7. The shuttles can hold 17 passengers and haul a dozen bikes. During the day, they'll go over the Macdonald Bridge and overnight use the MacKay Bridge.

The shuttle service will use a "load and go" system during peak morning and afternoon travelling times. The rest of the day it will run every half hour.

Cyclist Kimberley Watson uses the bike lane all year round — rain or shine, winter or summer.

"In the winter, it's actually quite refreshing. It's not that bad if you dress for it." Watson said. "I just love it, it's a good way to start your day."

In the evenings, Watson says shes use the ferry. However, the ferry's schedule doesn't begin in time for her to use it in the morning.

Cyclist Kimberley Watson worries about the impact of the shuttle service on the timing of her commute. (CBC)

Watson worries about the impact of the shuttle service on the timing of her commute.

"Who knows how long it's going to take to fill those up at 5:30 a.m.," Watson said. "I still want to get to work early so we'll see what happens."

Carolyn Pineau says she will miss her daily treks across the bridge. For the past six years, Pineau has got off the bus at the Dartmouth terminal so she can include a walk across the Macdonald Bridge during her commute. Now, she plans to simply remain on the bus.

"I've seen dolphins, I've seen seals, I've seen a lot of ships come and go." Pineau said. "I'm going to miss it. I really am."

Bridge officials recommend that shuttle users allow for some extra time in their commutes. But, they add they will adjust the schedule if needed.