Transit changes to adjust to street closures and increased summer usage will start on Monday, June 24. Granville Mall will once again close during summer weekends for the City of Vancouver's Viva Vancouver program that turns streets into public spaces . The closure means weekend detours of all trolley buses to Howe and Seymour streets. Routes affected are the 4, 6, 7, 10, 14, 16, 17, 20 and 50. The 800-block of Robson Street will also see summer closures due to Viva Vancouver, prompting detours for the 5 and 6. Construction on Powell Street near Clark Drive will detour routes 4, 7, 209, 210, 211 and 214 for a year. There are also minor changes to some routes and bus bay assignments. The 19 will run every six minutes due to summer demand between downtown and Stanley Park. Until Labour Day, the SeaBus will increase service to every 15 minutes between 10 a.m. to 7 p.m.