Paul Walker's fatal car accident my have been caused, in part, by plastic, reflective road markers known as Botts' Dots.
Sources close to Walker's family tell TMZ
that they've been in contact with stunt experts who believe the Porsche Carerra GT that walker was riding in may have hydroplaned on the road bumps.
The car's speed — experts say it may have been traveling 90 mph — plus its special racing tires, which have little tread, may have caused the car to lose traction after hitting the dots.
In 2004, Porsche sent a memo to dealers regarding the Carrera's control problems. "This vehicle cannot drive over a Foster Beer can that is lying on its side," it said. "It will crush the can and damage the carbon fiber under panels. You need to be aware of what type of road surface you are on (dips, pot holes, seam heights, etc.)."
Law enforcement officials have not found the exact cause of the Nov. 30 accident.
Walker's funeral arrangements were underway Tuesday at Forest Lawn Memorial Park in Hollywood Hills, a source tells E! News. The service will be open only to family members, but another private memorial this weekend will be open to friends and family, including Walker's Fast and Furious co-stars.