years. a little more than three hours from now the martin luther king jr. memorial will be dedicated. activities begin at 8:00. the dedication program begins at 9:00 along the tidal basin. 50,000 people are expected to attend. president obama will deliver the keycoat address starting at 11:00. jesse jackson and members of the king family will speak. make sure you pack patience. several roads around the tidal basin and national mall are already closed for the event. among them, parts of constitution and inside avenue as well as ohio drive. the roads will remain closed until the police deem them safe again. it s also operating extra trains to handle the large crowds. if the crowds are too much to handle, don t worry, you can see all the ceremony live on nbc washington nonstop starting at 10:00 a.m., verizon 460, cox 803 and over the air at 4.2. a number of demonstrations are setting the back drop for today s dedication. thousands took over the streets of d.c. this w