The speed limit should be increased on roads other than C-D road. In real life, a truck can accelerate to 90 km/h and 100 km/h, but when these trucks go into production, their dials are 150. So trucks can reach speeds of 150 km/h. . If we think about it another way, a car can go up to 300 km, but it can't because there is a speed limit. However, on a German highway with no speed limit, it can go up to 300 km/h as it wishes. You decide how realistic it would be to force our own truck to slow down. There are some roads where you can go at 130 km/h, there are some roads where even 90 km/h is too much. Speed limits can be useful in crowded areas, but what good are they if there's a speed limit at one end of the map?