Проще некуда...
http://www.trafficengland.com/api/events/getAlerts?start=0&step=100&order=Severity&is_current=1&events=CONGESTION,FULL_CLOSURES,ROADWORKS,INCIDENT,WEATHER,MAJOR_ORGANISED_EVENTS,ABNORMAL_LOADS&unconfirmed=false&completed=false&includeUnconfirmedRoadworks=true&_=1573508267254
http://www.trafficengland.com/api/events/getAlerts?start=100&step=100&order=Severity&is_current=1&events=CONGESTION,FULL_CLOSURES,ROADWORKS,INCIDENT,WEATHER,MAJOR_ORGANISED_EVENTS,ABNORMAL_LOADS&unconfirmed=false&completed=false&includeUnconfirmedRoadworks=true&_=1573508267255
Обратите внимание на
start=0&step=100
start=100&step=100
start=200&step=100
...
Не чего крутить не нужно.
Вам всё на тарелочке положили, просто берите.