During the process of using a car, if the driver observes carefully, he will notice that the speedometer of some car models often has red and orange lines at the 30 - 60 km/h mark. Not only old cars use analog mechanical clocks, some new cars use speedometers displayed on LCD electronic screens also have these symbols.

The red and orange lines at the 30-60km/h mark on the speedometer are not only for decoration but also to warn the driver. However, not all car users understand the meaning of these lines. Some drivers do not even pay attention to this detail.

On some current car models, especially older Mercedes-Benz models, colored stripes (red or orange) appear on the speedometer at 30 - 60 km/h to indicate the urban speed limit. This is the standard in many European countries - where the maximum speed limit when driving in residential or urban areas is 50 km/h.

Therefore, the colored lines on the speedometer are like a guide, warning the driver about the speed limit that should be applied when driving in urban areas to comply with traffic laws and reduce the risk of accidents. Although the urban speed limit in many countries has been adjusted, it is generally below 60 km/h, depending on road conditions.

In addition to the colored lines at the 30 - 60 km/h mark on some car models, especially those of European car brands, other colored lines may also appear at other speeds. Especially the speed mark from 30 - 35 km/h. In addition, the marks above 120 km/h on the car speedometer also often have those colored lines to warn drivers of exceeding the maximum speed allowed when driving on the highway.

However, many new car models today are no longer designed with red lines on the speedometer. Instead, manufacturers often equip speed limit setting systems or audio and visual warnings to remind the driver.

In fact, whether the speedometer has warning lines or not, the driver still needs to concentrate and pay attention when driving in traffic. Because the prescribed speed limit will always change depending on each road section.