GMSNavigationSpeedAlertSeverity
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,
}- 
                  
                  Either speed or speed limit could not be determined. DeclarationSwift case unknown = -2Objective-C GMSNavigationSpeedAlertSeverityUnknown = -2
- 
                  
                  No speeding is occurring. DeclarationSwift case notSpeeding = -1Objective-C GMSNavigationSpeedAlertSeverityNotSpeeding = -1
- 
                  
                  Minor speed alert. DeclarationSwift case minor = 0Objective-C GMSNavigationSpeedAlertSeverityMinor = 0
- 
                  
                  Major speed alert. DeclarationSwift case major = 1Objective-C GMSNavigationSpeedAlertSeverityMajor