In Europe what is the speed limit in a town when the roads are wet due to heavy rain?

In Europe, speed limits in towns generally remain the same regardless of weather conditions, but drivers are expected to adjust their speed according to the road conditions. When roads are wet due to heavy rain, it is advisable to drive at a reduced speed to maintain safety and control. Specific local regulations may vary, so it's important to be aware of any posted signs or laws in the particular country or region.