The sign "End of a 30 km/h zone" indicates that you are leaving a designated area where the maximum speed limit is 30 kilometers per hour. This speed limit usually applies in areas where there might be a high number of pedestrians, such as residential neighborhoods, near schools, or in places where there is a lot of foot traffic.
Once you pass this sign, you are free to return to the general speed limits applicable for the road type you are on, unless otherwise indicated by additional signs. Always remain alert and mindful of the road conditions and any potential hazards, especially in areas where lower speed limits have been established for safety reasons.