Pirelli vows to address 'marbles' problem

Dec.9 (GMM) Pirelli will try to solve the problem of trackside 'marbles' ahead of the 2014 season.

That is the vow of the official supplier's F1 chief Paul Hembery, amid complaints the heavily degrading tyres of the past few seasons left too much slippery debris alongside the racing line.

"The drivers have of course spoken about it, we understand that and will try to do something about it," the Briton is quoted by Speed Week.