Up to 30 drivers a day are being issued with parking tickets on a country road in West Norfolk.
Civil enforcement officers have been patrolling the B1145 Gayton Road at Bawsey Pits, near King's Lynn, in the recent hot spell.
Clearway restrictions prevent vehicles parking on both the road and the verges for safety reasons.
But in a report to councillors Kathy Mellish, West Norfolk council's cabinet member for facilities, says: 'On occasions they have issued 30 tickets in a single day which demonstrates the scale of
the problem in this area.
'Our staff have been subjected to threats and abuse whilst undertaking their work and I stress, it is a matter of safety to keep this road vehicle-free.
'Anyone driving along that road will know how dangerous it
can be especially if another driver is not sticking to the speed limit or if people/children walk onto the road to their cars, other drivers will have to cross the central line to avoid them.'
Mrs Mellish said the council was working with police to ensure the road was kept as free as possible.
She added: ' I would ask for everyone to help spread the message that, we will not tolerate aggression toward our staff, they are doing a job to keep us safe, and illegal parking will result in a fine.'
Hundreds visit the lakes on hot summer weekends. Many park on the roadside, because the gates to the car park have beeen locked.
The nearby Bawsey Bumps are a notorious accident blackspot, where there have been several fatalities.
Last year, the road was declared a clearway meaning parking was illegal. Those who do so face fines of £70, which can be reduced to £35 if paid within 14 days.
Many ignore warning signs not to swim in the former sand workings. In July 2013, Umar Ballogen, 16, from North London and Ryan Pettengell, 41, from King's Lynn drowned on the same afternoon in the pits.
In May parts of the site were left strewn with rubbish after an illegal rave.
Stephen Bacon, who owns the pits, has said work will begin soon on turning them into a country park.
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