高速公路的隧道应在两侧设置检修道，其宽度应()m。
A．小于等于0.75
B．大于等于0.80
C．大于等于0.75
D．小于等于0.80
参考答案：C
解析：高速公路、一级公路的隧道应在两侧设置检修道，其宽度应等于或大于0.75m。二、三级公路的隧道宜在两侧设置人行道(兼检修道)，其宽度应等于或大于0.75m。四级公路可不设人行道，但应保留0.25m的C值。
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