Thousands of Pakistani lawyers and supporters are heading to Islamabad to demand the government reinstate judges fired by President Musharraf last year.Crowds along the route cheered the motorcade of several hundred vehicles, which is due to arrive later on Friday.
Security is tight in the capital ahead of a rally in front of parliament.
Protesters want the new government to honour pledges to reinstate the judges swiftly and without conditions. The two main parties disagree on how to do so.
Barricades have been set up around the presidency and parliament buildings and extra security forces brought into the capital.
The BBC's Barbara Plett in Islamabad says the authorities are nervous about potential violence.
But neither side wants trouble and they have reached agreement on a designated route through the city, our correspondent says.
'Musharraf's last days'
The lawyers and political activists are travelling in a convoy of buses and cars from the city of Lahore on the last leg of a nationwide protest which started earlier this week.
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