Itineraries cover the day and stop. The gap arrives every night. The streets go quiet. Others fill up. The pattern differs by place and climate. Where the day is uncomfortable, life shifts later. Afternoons are for staying indoors. Where the evening is cold, the day is the active part. Commerce stops and life continues. In many places the interesting part starts once the shops shut. The character of a place changes rather than simply dimming. The composition shifts. Which is one reason to walk the same street twice at different hours. Two visits to one street outperform one visit to two. The hour before dark is the good one. Anything looks better in it. Which makes the last hour of daylight worth planning around. Safety considerations vary and follow the same rules as anywhere. The same judgment used at home. Local everyday advice (look at more info) is available and specific. Local knowledge beats assumption. Arriving when the locals arrive works better. Turning up when a place is empty rarely produces the best of it. Anyone who stayed out past the itinerary planned toward the last hour of light.