| 摘要 |
PROBLEM TO BE SOLVED: To provide a testing course in which the reproduction of a testing condition is easy and a change in testing environment can be suppressed.SOLUTION: This testing course 2 is a mud performance estimation testing course 2 of a tire, and includes: a ground layer 6 whose upper surface is tilted; and a mud layer 8 spread over the upper surface of this ground layer 6, and the ground layer 6 has a portion formed from the soil hardened by being mixed with a soft soil improving agent. An average depth of the mud layer 8 is not less than 3 cm and not more than 50 cm. A gradient &thetas; of the fall line FL which is the maximum gradient line of an inclined plane 4, which is the upper surface of the mud layer 8, represents a ratio of an altitude difference Z of both ends of a horizontal direction distance Y to the horizontal direction distance Y of this fall line FL in a percentage, and is preferably not less than 2% and not more than 8%. |
