Unusually tight security and large-scale traffic regulations for the two-day Group of 20 summit in Osaka is affecting the lives of residents and tourists.

The city remained on high alert on the summit's first day on Friday. A helicopter circled over the Intex Osaka convention center, the main venue of the summit on Sakishima, a man-made island in Suminoe Ward, and numerous police officers were deployed around the site.

Highways heading to Sakishima were closed early Thursday morning and all vehicles near it were inspected by police.