NS_ENUM(NSInteger, GMSNavigationSpeedAlertSeverity) {
  /** Either speed or speed limit could not be determined. */
  GMSNavigationSpeedAlertSeverityUnknown = -2,

  /** No speeding is occurring. */
  GMSNavigationSpeedAlertSeverityNotSpeeding = -1,

  /** Minor speed alert. */
  GMSNavigationSpeedAlertSeverityMinor = 0,

  /** Major speed alert. */
  GMSNavigationSpeedAlertSeverityMajor,
}