ON HIGHWAY E-5, Turkey — Next to a busy road in an uncelebrated part of northern Anatolia, Aykut Erdogdu, a Turkish lawmaker, nursed his bandaged, blistered foot. Beside him, another Turkish lawmaker tended to a bleeding toe that had turned slightly purple.

This unlikely scene was being repeated dozens of times in this crowded area by the road, where roughly 30 lawmakers from Turkey’s main opposition party, as well as about a thousand members of the public, were suffering from sore soles.

It was Day 14 of the March for Justice, an epic trudge started by the Republican People’s Party, or C.H.P., that began in Ankara, the capital, on June 15 and is scheduled to end some 250 miles later — as the crow flies — in Istanbul on next Sunday.

By day they walk about 15 miles, and by night they sleep in rented caravans or hotels. In recent days, the marchers slogged up a mountain in the rain, and one died of a heart attack on the way. Here on Highway E-5, they have finally reached some flat farmland, but now have to walk in the blazing sun. Nevertheless, their numbers are swelling, with over 10,000 new marchers reported since a New York Times journalist visited them last week.