An open meeting will be held in Warwick Bridge on plans to divert heavy traffic away from the village.
The proposals would see the A689 diverting traffic away from the A69 at Brampton.
Campaigners say the A689 is a straighter wider road that doesn't pass through any centres of population.
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Over the next eight years the populations of all but nine local authorities in England will increase. Four of those are in Cumbria.
The Psychoactive Substances Act will come into effect tomorrow, and could see offenders jailed for up to seven years.