concrete mixing transport speed limits

The car is the car's maximum speed dynamic three indicators. Truck manufacturers attach great importance on this indicator will be listed as an important performance indicators.
In fact, all the cars speed tests are conditional restrictions. "Technical conditions" states: Concrete mixing plants test is to perform "car Maximum speed test methods" (GB / T 12544); minimum speed of the test is to perform "car lowest steady speed test" (GB / T 12547)). However, for the determination of these two speeds venue requirements and are in accordance with "car road test method General" (GB / T 12534) which provides that "unless otherwise specified road test, the performance test shall be clean, dry , flat, paved with asphalt or concrete road on the line ready mix concrete plant 2 ~ 3km, width of not less than 8m, longitudinal slope of 0.1% during this period. " It can be seen, the highest truck (low) speed data tests are specifically designated carried out on the straight road.