getVehicleDriftAngle

function getVehicleDriftAngle(theVehicle)
    if getElementType(theVehicle) ~= "vehicle" then
        return false
    end

    local vX, vY = getElementVelocity(theVehicle)
    if (vX == 0.0 and vY == 0.0) then
        return 0.0
    end

    local rotX, rotY, rotZ = getElementRotation(theVehicle)

    local moveDirection = math.deg(-math.atan2(vX, vY))

    if rotZ > 180 then
        rotZ = rotZ - 360
    end

    local driftAngle = moveDirection - rotZ;

    if driftAngle < -180.0 then
        driftAngle = driftAngle + 360.0
    elseif driftAngle > 180.0 then
        driftAngle = driftAngle - 360.0
    end
    return driftAngle
end