The Road Haulage Association has described the economic impact of the repeated disruptions in Calais as "horrendous".
It said the situation is putting truckers' "lives and livelihoods" at risk as it called for "an urgent solution."
The RHA's Kate Gibbs said: "We have heard stories of drivers being threatened with knives. What I cannot stress enough is that these truckers are not getting the recognition they deserve.
"They are doing a fabulous job for the haulage industry, and the supply chain relies on them. Every member of the public relies on HGV drivers.
...The French don't see it as their problem but we have got to see action."
Officers in Poole are appealing for witnesses and anyone with information to come forward after reports of a man threatening members of the public with a knife – with one man being arrested.
Dorset Police was called to the incident in Sterte Avenue in the Holes Bay area at 6.49am this morning.
Officers, including armed police, attended and searched the area. The NPAS helicopter also assisted in the search.
Nobody was injured during the incident.
A 29-year-old man, of an unknown address, has been arrested relation to this incident and is helping officers with their enquiries.
Last night around 25 KFRS firefighters dealt with five fires across 20 hectares of cut grass and reed in Lydd ranges.
Crews sectorised the multiple seats of fire that included an area of 10 hectares of reed banks alight, and an area of 300 metres square of grass alight.
Firefighters used equipment a 4x4 vehicle with a fogging unit that fires a super fine mist that can suppress fires using minimal water, and which can penetrate deeply into the base of the undergrowth. They also used flexi back packs with water hose sprays and beaters to contain the fires. They did a further inspection at the next morning to search for any remaining hotspots, amp them down.
The area is mainly grass and gorse which over many years has been compacted. This means a fire can be very deep seated and can spread, especially during periods of prolonged hot, dry weather when there has been little rain to saturate the undergrowth.
Cars were seen floating down the street in the early hours of this morning as the south coast was battered by violent storms just days after the UK was cooked by sunshine on the hottest day of the year.
Exhausted firefighters worked all through the night to help people out of their homes as torrential rain and lightning storms led to major flooding.
Crews from Dorset Fire and Rescue Service were called to a number of flooded properties in the middle of the night in Bournemouth.
A spokesman for Dorset Fire and Rescue Service said: "Crews have been out all over the county dealing with flooding after the storm, some crews travelling 40 miles from their home stations. We handled over 120 calls in the space of two hours with just four operators to hand."
Resident Melvin Lockey was walking home in West Howe, Bournemouth, in the storm at 1am when he witnessed the chaos.
The 32-year-old said: "I was walking down the street when all of a sudden I saw a car floating past me in the water. The streets in the area were just like rivers, the storm was so bad."
The flash floods erupted just three days after the UK faced one of the hottest days on record, with temperatures reaching highs of up to 36.7C. Ends
Delays of up to 50 minutes on South West Trains between Bournemouth and Wareham due to trespassers on the line.