Title rivals rue traffic problems

Glock, who will start sixth, blamed iSport teammate Andreas Zuber and DPR's Christian Bakkerud for compromising his qualifying runs.

"On the first set of tyres, the car was not perfect," said Glock. "On the second set, I was messed up by Andi at the chicane, and then Bakkerud did it to me as well on the next one.

"After the first two sectors I was five-hundredths up on pole, so I'm sure I would have been first, second or third - ahead of di Grassi at least."

Title rival di Grassi also had an eventful session, and set his fourth fastest time after being hit by Mike Conway at the chicane. He was also accused by Karun Chandhok for balking him twice, once at high-speed through Eau Rouge.

"It was a very strange qualifying," admitted di Grassi, who is 11 points behind Glock with four races remaining. "I was trying to open my lap and Mike was trying to close his. He hit me quite hard, but there was no major damage, but I'm sure the toe-ins were damaged.

"Very few people had no problem with the traffic. For the championship, starting two places ahead of Timo is a good start."

Luca Filippi, who was knocked off pole in the last three minutes, also had a run-in with a rival, Markus Niemela, on his best lap.

"I was 17-hundredths up on my best first sector, and the second sector was normal," said Filippi. "All I had to do was close the lap, and the third sector is the easiest. I came up on him [at Stavelot] and he seemed to go straight, to let me past, but then he turned in and I had to brake to miss him.

"Traffic always happens, but you can penalise people and ask them not to do it again. I could have blocked him on his fast lap, but that's not my style. I'd say it's a bit ungentlemanly."

Conversely, surprise pole man Nicolas Lapierre said he encountered no traffic on either of his fastest two laps. He took pole by just 0.011 seconds.