Protesters at this summer's Democratic National Convention in Boston may be confined to a cozy triangle of land off Haymarket Square, blocked off from the FleetCenter and convention delegates by a maze of Central Artery service roads, MBTA train tracks, and a temporary parking lot holding scores of buses and media trucks

Under a preliminary plan floated by convention organizers, the "free-speech zone" would be a small plot bounded by Green Line tracks and North Washington Street, in an area that until recently was given over to the elevated artery. The zone would hold as few as 400 of the several thousand protesters who are expected in Boston in late July.