Review speed limits on all roads with street lights or without white lines

Apply the same simple logic of speed limits on specific urban roads to specific narrow rural roads where 60mph is also unsafe. We think this is needed to make the law sensible; to reduce road fatalities and to reset all modern Sat Navs that wrongly assume 60mph can be safely achieved on these narrow rural roads. The cost of this change is negligible (no signage necessary) and the benefits immediate.