From HHB:
Halifax Harbour Bridges (HHB) advises motorists of the following closures for the Angus L. Macdonald Bridge on Sunday, May 23rd:

 
• 9:00am to 11:30am the Macdonald Bridge will be closed to all vehicle traffic
• The pedestrian and bicycle lanes will remain open  
• 11:30am to 12:30pm traffic on the Macdonald Bridge will be reduced to one lane in each direction
• The Barrington Street ramp will be closed from 9:00am to 12:30am
 
 
The closure is taking place to accommodate the running of the Scotiabank Bluenose Marathon.
 
HHB is the forward thinking manager of key transportation infrastructure assets in the Halifax Regional Municipality. Its mission is to provide safe, convenient, efficient and reliable passage at an appropriate cost.