Brighton and Hove traders have voted unanimously to stage a second go-slow protest against Parking charges.
Supporters of protest group Traders Against Parking Persecution (Tapp) met last night and decided to act on August 19.
They also declared that if high charges were not curbed, call-out fees could rise by £20 to £30.
More than 311 vans owned by members and supporters of Tapp held a convoy on June 5 in opposition to the new waiver scheme.
They are determined to double that number a week on Monday.
Committee chairman Jeff Hunt, of Coleman Hunt, told the meeting in the Brunswick pub in Holland Road, Hove: "I have met and talked to officers at the city council, laying out our demands, but their response has not been good enough. We have no choice.
"I have had three calls from the council in the past week. That shows they are concerned about our power. This time it will be bigger and better. We want at least 600 vehicles."
Traders say the new parking waiver scheme only allows them to park on double-yellow lines and that the tickets, which cost £3 per day, have to be bought from the council, which takes up time.
The pilot traders' permit parking scheme costs £300 a year, compared with £82 for residents, and allows workmen to park for up to two hours in restricted parking bays until 4pm.
Mr Hunt said: "We want permits issued annually or quarterly, allowing us to park in pay-and-display and residents' bays all day. Or we would like a card or voucher system introduced with no limit on the number issued, if it's proved they're for genuine use."
Councillor Heather James, deputy chairwoman of Brighton and Hove City Council's environment committee, said: "We believe it's unnecessary to hold another demonstration.
"The council is actively encouraging traders to provide feedback on the scheme and is always happy to meet them to discuss their concerns."
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