Welding a car in a certain area

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The Spatial Query API is a better option to use for this than Touched & TouchEnded. Every time the seat occupant changes, check to see if the player got up. If they did then query with GetPartsInPart along the lines of this snippit:

-- first, make an array of CarDeckWeld parts to use as a filtered list
local FilterList = {ship.CarDeckWeld1, ship.CarDeckWeld2}

-- second, create OverlapParams object for the query
local params = OverlapParams.new()
params.FilterType = Enum.RaycastFilterType.Whitelist
params.FilterDescendantsInstances = FilterList

-- third, handle occupant changed
car.Seat:GetPropertyChangedSignal("Occupant"):Connect(function(plr)
    if script.Parent.Occupant == nil then
        local overlappingParts = workspace:GetPartsInPart(car.BoundingPart, params)
        if #overlappingParts > 0 then
            local Weld = Instance.new("WeldConstraint")
            Weld.Name = "CarDeckWeld"
            Weld.Part0 = car.BoundingPart
            Weld.Part1 = overlappingParts[1]
        end
    end
end)

where car.BoundingPart is a part in the car, sized so it contains the entire car. that will ensure any part of the car can be parked on a CarDeckWeld part and still trigger the weld.