On 4pda Garmin forum Cnfhbr push me on one experiment with my 3597, and it was successful.
If you exceed speed limit of the road, speed counter goes to red color without any sound effects.
But if you use UK locale, you have that feature: "Audible Speed Alerts" (see it under Map&Vehicle in Preferences menu). Exceed speed - get sound alarm beep
In Russian locale (an France & Swiss too) we don't have that feature, but we can enable it.
BackUp all of you data, then in system menu "Clear all user data". After reboot select UK locale. Now we have "Audible Speed Alerts".
Change you native locale back via system menu (Developer info->Change Locale) and Voila! - we have our locale with speed alarm and new menu enabler for them!
Restore you data
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