PORTLAND — A walking tour of Congress Street, part of a look at ways to improve bus movement through downtown, will be held this afternoon, rain or shine.

The walking tour, which begins in Longfellow Square, will be followed by an open house and then a forum on how buses operate in the Congress Street corridor and possible traffic pattern changes.

City officials are considering a number of steps, such as cutting back on the number of bus stops, restricting left-hand turns or no longer having buses pull out of the line of traffic to a curb cut to let riders get on or off.

Today’s walking tour and forum are part of an effort to gather the public’s thoughts about the possible changes.

The walking tour begins at noon at Longfellow Square and heads to Lincoln Park. At the park, the return walking tour will begin at 1 p.m.

The open house will be held at the Institute for Contemporary Art at the Maine College of Art, beginning at 4 p.m. The forum will follow and conclude at 7 p.m.