一、交通基础设施1.公路2.内河航道内河航道通航里程继续增加,等级航道所占比重提高。2007年年底,全国内河航道通航里程123495km,比上年末增加107km。其中,等级航道61197km,占总里程的49.6%,比上年末提高0.1个百分点;三级及以上航道8822km,占总里程的7.1%,比上年末提高0.1个百分点;五级及以上航 I. Transportation Infrastructure 1. Roads 2. Inland Waterway Inland waterway navigation mileage continues to increase, and the proportion of grade waterways increases. By the end of 2007, the national navigation channel mileage was 123,495 km, an increase of 107 km from the previous year. Among them, the grade fairway 61197km, accounting for 49.6% of the total mileage, an increase of 0.1 percentage points over the previous year; Grade 3 and above fairway 8822km, accounting for 7.1% of the total mileage, an increase of 0.1 percentage points over the previous year;