Mai Hoa, a learner driver, is finding it challenging to memorize the complex speed limit regulations required for her upcoming driving test. She notes the difficulty in establishing clear rules to differentiate permissible speed ranges, such as 50, 60, or 70 km/h for specific vehicle groups, or 80 and 90 km/h for certain road types. This lack of a clear system makes it hard to confidently apply the rules for safe driving.

The current curriculum includes approximately 10 questions on vehicle speeds, often featuring intricate scenarios. For instance, one question asks, "On a road, in a densely populated area, a divided road or a one-way road with at least two lanes for motor vehicles, what is the maximum permissible operating speed for two-wheeled motobikes and oto cars carrying up to 28 people, excluding the driver?"

Another example presents a similar challenge, "On a road outside a densely populated area, a divided road or a one-way road with at least two lanes for motor vehicles (excluding expressways), which vehicle type below is allowed to travel at a maximum permissible operating speed of 70 km/h?" These detailed questions highlight the need for a systematic approach to memory retention.

Mai Hoa is seeking guidance from experienced readers, hoping for practical advice or mnemonic rules to help distinguish these varied speed limits. Such strategies would greatly assist her in preparing for the driving test and ensuring safe driving practices on the road. Your insights are greatly appreciated.