What are a property owners right's when the county wants to take half my land for a county road improvement project

Maricopa County, Arizona, proposes a road improvement project that will affect 40 property owners? Some will lose entire property, some will lose portions, including water well but not home. Project is at design concept stage with no further funding. There are alternatives, but all have some affect on homeowners. This proposal has the greatest effect on residential property. Reasons for project are current roadway does not meet 2000 design standards, projected growth in area for 2030, high incidence of fatal accidents in S curves of current raodway, majority of fatal accidents are alchohol related. Proposed plan uses some vacant state land in addition to residential properties. An unproposed alternative could possibly use all state land.