There could be several reasons why other drivers are overtaking you even though you are driving at the high speed limit (120 km/h):
Speed Variability: Not all drivers adhere strictly to the speed limit. Some might drive slightly above the limit, while others may drive significantly faster. As a result, you may encounter drivers who are simply driving faster than the speed limit.
Different Comfort Levels: People have varying comfort levels with speed. Some drivers feel more at ease driving faster, while others prefer a slower pace. It's not uncommon for drivers to find their own comfortable speed, which might differ from the posted speed limit.
Traffic Conditions: The traffic flow can vary on the freeway. If you encounter pockets of less congested areas or open lanes, some drivers may take the opportunity to overtake slower-moving vehicles.
Differences in Vehicles: The type and condition of vehicles can influence their speed capabilities. Some cars are designed for higher performance and may have no trouble going faster than the speed limit, while others may be less powerful and have limitations.
Personal Urgency: Some drivers might be in a hurry or have time constraints, prompting them to drive faster to reach their destination more quickly.
Law Enforcement: Some drivers might be conscious of speed enforcement and choose to drive just below the radar to avoid potential speeding tickets.
It's important to remember that adhering to the speed limit is the law, and it promotes safety on the roads. Driving at the speed limit helps maintain a smoother flow of traffic and reduces the risk of accidents. However, it's also crucial to stay aware of the traffic conditions and adjust your speed accordingly to ensure a safe driving experience. If you feel pressured by drivers overtaking you, it's best to maintain your speed and let them pass when it's safe to do so.