May 9 (GMM) Morning practice got off to a quiet start at Istanbul Park on Friday.

The 'Otodrom' venue was declared wet by race control just prior to the green light at 10am, after circuit workers left the racing line between turns 3 and 9 damp following a late spate of cleaning activities.

For almost the entire opening hour of the 90 minute session, most runners opted simply for a one-lap installation before returning to the pits to wait for the circuit to dry.

Toro Rosso driver Sebastian Vettel said the track was "particularly slippery" through the awesome turn 8 left-handers, and once the action got underway deep into the session, a few drivers - including Jarno Trulli, Giancarlo Fisichella, Lewis Hamilton and Felipe Massa - had spins.

Meanwhile, race stewards are likely to look dimly upon Force India driver Fisichella's apparent running of the red light at the very beginning of the session.