A late-night crash in Waikiki left a moped driver seriously injured, a reminder of how dangerous the area's streets are after dark.

• A 52-year-old moped rider was hurt in a head-on collision near Kuhio Avenue and Napua Street.
• He was wearing a helmet but still suffered serious injuries.
• A 62-year-old man involved was also taken to the hospital for treatment.
• Police are still investigating what caused the crash.

Outlook: The cause remains under investigation, with no word yet on charges or citations.