McLaren boss Ron Dennis says slow backmarkers cost Kimi Raikkonen the world championship and could rob his team of the constructors' title. "If it costs us the constructors' championship, it is not particularly nice," Dennis said.
"It's virtually impossible to go out in a session and drive round uninterrupted by a gaggle of slow cars.
"The drivers who just don't get out of the way, they influence the outcome of world championships."
Raikkonen's title quest was ended at Sunday's Brazilian Grand Prix.
He finished second to Juan Pablo Montoya, but Fernando Alonso became the youngest world champion in Formula One history with third place at Interlagos.
But the constructors' title is still up for grabs. McLaren top the standings on 164 points, two ahead of Renault with two races to go.
Alonso's Renault has not been the fastest car this season, with McLaren enjoying a clear performance advantage at most races.
However, a number of mechanical problems have handicapped Raikkonen, while two collisions with backmarkers also played their part in wasting that advantage.
Raikkonen's team-mate Juan Pablo Montoya, who won on Sunday, was knocked off track late in the races in Turkey and Belgium, handing Alonso four points he was not expecting.
"You don't ask them to detract from their race but there is a pattern," Dennis said.
"I don't want to name names, of drivers who just don't behave like Grand Prix drivers, respecting people who are better drivers and in better cars.
"It's not fair and there's lots of time when these backmarkers have not only caused incidents, there are many times when they have influenced the outcome of races because it is very difficult to get past.
"There are those people who say incidents, accidents, interfering with the leader and everything is good for Formula One. But if you are on the receiving end it is damned frustrating."
MMIX
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There are many times when they have influenced the outcome of races because it is very difficult to get past