An enquiry by the Eryri National Park Authority is planned after scores of visitors descended into the park over the Easter bank holiday weekend, creating delays and frustration for visitors.
North Wales Police have confirmed today that inconsiderate parking was behind some of the problems which saw motorists struggle to get close to many of the car parks.
A spokesperson for North Wales Police said: "Whilst we appreciate people are visiting Eryri National Park to enjoy the weather and stunning scenery, we are urging motorists to be responsible and think about where they park and to make full use of the park and ride facilities that are available.
"The irresponsible and dangerous parking we witnessed in Pen y Pass and Llyn Ogwen yesterday on Good Friday not only risks lives, but also prevents emergency vehicle access."
Almost 40 vehicles parked dangerously on the narrow mountain routes were recovered yesterday, including 29 near Llyn Ogwen and nine in Pen y Pass.
"We continue to work closely with our colleagues at Gwynedd Council and the Eryri National Park to help reduce the risk to walkers, cyclists and other road users."