More than 600 people have signed an online petition.
The 20-year plan will replace road impact fees.
The Venice and South Siesta Key projects could lower the TDT fund to a critical level.
The board will head an update at tomorrow's meeting on the mobility plan.
Sarasota County staff has drafted a report for commissioners after they requested an update on the county's affordable housing efforts in February.
All three projects are related to restorative efforts in the Sarasota Bay Estuary Program.
Peter van Roekens, chairman of Save Our Siesta Sands 2, gave a presentation.