题目内容
从地区分布情况看，东、中、西各地区高速公路总量以及所占比重都存在较明显的差异。东部地区共有高速公路10878千米，占全国高速公路总里程的56％；中部地区5014千米，占25.8％；西部地区3545千米，仅占全国高速公路总里程的18.2％。在各地区的公路总里程中，东部地区高速公路所占比重为2.0%，中部地区为0.9％，西部地区仅为0.6％，中部地区所占比重不到东部地区的一半，西部地区不足东部地区的三分之一。在全国高速公路超过1000千米的7个省中，东部地区有5个，其中山东超过2000千米，达2077千米，河北、广东分别超过和达到1500千米，而中、西部地区高速公路超过1000千米的省各只有1个，分别是河南1077千米和四川1144千米。
按照统计资料，山东高速公路里程占本区域的比例为()。
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