Why isn't it done as a pay-as-you-go deal with developers? Make the permit to break ground contingent on making arrangement to finance the road and utility bui

Why isn't it done as a pay-as-you-go deal with developers? Make the permit to break ground contingent on making arrangement to finance the road and utility build-outs? Arizona has been surprisingly forward thinking about tnis in recent years (https://www.fhwa.dot.gov/ipd/pdfs/value_capture/strategies_in_practice/az_development_impact_fee.pdf https://www.fhwa.dot.gov/ipd/pdfs/value_capture/strategies_i...) but it doesn't seem to impede their suburban sprawl much.