I cross the Bay Bridge over the Chesapeake Bay in Maryland a few times a week, so I signed up for a traffic alert email set up by the MDTA.  This is one I received yesterday (Wednesday June 27th 2012).

There are no coincidences.

6/27/12 -- HEAVY FRIDAY TRAFFIC EXPECTED DUE TO CONVOY
baybridge.com mdta@baybridge.com via publicaster.com

Jun 27 (1 day ago)

HEAVY FRIDAY TRAFFIC EXPECTED AT BAY BRIDGE
Motorists Advised to Travel Off-Peak, Call 1-877-BAYSPAN (229-7726) for Current Traffic Conditions

Due to two military convoys, motorists should expect high traffic volumes on Friday, June 29, at approximately 12 noon, when 27 vehicles will arrive eastbound at the bridge, and at approximately 1 p.m., when 61 vehicles will arrive eastbound at the bridge. The MDTA will direct the groups to the far-right side of the toll plaza.

Weather permitting, the MDTA will implement two-way traffic operations to help alleviate delays and encourages motorists to travel off-peak. The best times to travel are:
Thursday and Friday before 10 a.m. and after 10 p.m.
Saturday before 7 a.m. and after 5 p.m.
Sunday before 10 a.m. and after 10 p.m.

This summer season has been very busy so far with travel to the Shore. Mid-day traffic returning from the Shore on Sundays has led to back-ups along the westbound US 50/301 corridor. Travel off-peak when returning home on Sundays - travel before 10 a.m. or after 10 p.m. Expect major delays when traveling during peak hours.