Travel routes and bus schedules will be affected Friday afternoon and evening when certain streets will be closed for President Obama’s campaign events at Southern Maine Community College in South Portland and the Portland Museum of Art.

Police advise drivers and pedestrians to anticipate road closures, delays and the need for additional travel time from 2 to 6:30 p.m. in South Portland and from 6 to 10 p.m. in Portland.

The presidential motorcade from the Portland International Jetport to the college, from the college to the museum, and back to the jetport will cause “rolling” street closures and minor traffic delays.

Police wouldn’t release the exact motorcade route for security reasons.

In South Portland, longer closures are likely on roads that run through the waterfront campus, including Benjamin PIckett and Fort streets.

In Portland, the following streets will be closed from 6 to 10 p.m.:

— High Street between Danforth and Congress streets.
— Spring Street between Park and Oak streets.
— Free Street between Congress and Oak streets.
— Oak Street between Free and Spring streets.

For passengers of the South Portland Bus Service, schedules will be interrupted and drivers and dispatchers will try to minimize inconvenience for passengers.

Buses may be restricted from access to certain stops, even if other vehicles are traveling by, according to South Portland officials.

In downtown Portland, all stops from 5 p.m. to 9:30 p.m. will be on York or Fore streets.

During that period, the bus will collect passengers at a temporary stop at Fore and Union streets, in front of the Portland Harbor Hotel. The bus also will make regular stops along York Street at Pleasant, High and State streets.

In South Portland, from 2 to 6:30 p.m., the bus for Willard Square and SMCC will stop on Preble at Fort Street and Broadway.

Passengers on buses traveling to the Maine Mall, near the jetport, should anticipate delays throughout the afternoon and evening.