Police person warned that amerciable parking astatine a northbound Wales quality spot volition spot much cars removed aft astir 40 vehicles were towed astatine the commencement of the Easter break.
North Wales Police said parking connected treble yellowish lines oregon obstructing roads successful Eryri National Park - besides known arsenic Snowdonia - "risks lives".
The contented forced the A5 roadworthy to adjacent connected Friday.
Large groups are expected to sojourn the country again crossed the weekend.
Police are urging drivers to marque usage of the parkland and thrust facilities disposable to assistance forestall further issues connected the area's constrictive roads.
On Saturday the unit said successful a connection that drivers successful breach of parking rules would person their vehicles removed "at their ain expense".
It said: "Whilst we admit radical are visiting Eryri National Park to bask the upwind and stunning scenery this Bank Holiday weekend, we are urging motorists to beryllium liable and deliberation astir wherever they parkland and to marque afloat usage of the parkland and thrust facilities that are available.
"The irresponsible and unsafe parking we witnessed successful Pen y Pass and Llyn Ogwen yesterday (Good Friday) not lone risks lives, but besides prevents exigency conveyance access.
"Almost 40 vehicles parked dangerously connected the constrictive upland routes were recovered yesterday, including 29 adjacent Llyn Ogwen and 9 successful Pen y Pass.
"Parking successful different parts of Eryri National Park volition proceed to beryllium monitored implicit the Bank Holiday weekend."
It added: "Any further vehicles recovered to beryllium parked connected the clearway, treble yellows oregon causing an obstruction volition besides person their conveyance removed astatine their ain expense. Please heed the warning."
On Friday Elizabeth Roberts, a section councillor whose ward covers the Ogwen area, said: "It was astir becoming a one-way roadworthy with cars parking the mode that they were, and it made it hard for exigency workers to get though.
"Drivers besides parkland successful beforehand of driveways truthful section radical cannot get retired of their properties, and it has a large interaction connected families who privation to locomotion astir the country erstwhile cars parkland connected the pavements."