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Overall, traffic volumes have remained fairly stable over the period for both commercial and general aviation (GA) operations. GA operations decreased during the first three years of the period from FY 2004 to FY 2006, when it reached its lowest level of activity, but these operations increased in FY 2007. Commercial aviation operations increased from FY 2004 to FY 2005; decreased from FY 2005 to FY 2006; and, similar to GA, increased again in FY 2007.
GA operations accounted for 54 percent of all airport activity, but GA aircraft were involved in 69 percent of runway incursions. Forty-one percent of operations during the period were commercial operations and five percent were military operations. The number of runway incursions for commercial and military aviation was proportional to their operations.
Frequency of Runway Incursions

During this period, there were about 250 million operations – approximately 170,000 per day at FAA-towered airports in the United States. Of these operations, there were 1,353 runway incursions – an average of one runway incursion per 184,775 operations during the four-year period. The rate of runway incursions remained steady from FY 2004 through FY 2006 averaging 5.3 per million operations per year.  The FAA reported 40 more incursions in FY 2007 than in FY 2006 increasing the incursion rate by 13 percent from 5.4 to 6.1 incursions per million operations.
Table 1. Number and Rate of Runway Incursions
FY 2004  FY 2005  FY 2006  FY 2007  Total 
Number of Runway Incursions  326  327  330  370  1,353 
Rate of Runway Incursions per Million Operations  5.2  5.2  5.4  6.1  5.5 

Total Number of Operations  63,126,312  63,104,415  61,076,341  61,131,629  248,438,697 

Severity of Runway Incursions

During the period, Category A and D runway incursions increased while Category B and C incursions decreased. The majority (92 percent) of runway incursions (1,241 of 1,353) were Category C and D events involving little or no risk of collision. The distribution of runway incursions showed a positive shift from more severe Category C events early in the four-year period to less severe Category D incursions later in the period.

From FY 2004 through FY 2007, 112 of the 1,353 incursions (8 percent) were Category A and B incursions. Together, these incursions increased in number and rate for the first three years of the period before decreasing in FY 2007. None of the 67 Category A incursions resulted in a collision.
The FAA met its performance targets for each of the years in the period and maintained the total rate of serious (Category A and B) runway incursions to 0.45 incursions per million operations for the overall time frame.
Types of Runway Incursions
The majority (55 percent) of runway incursions during the four-year period (FY 2004 through FY 2007) were pilot deviations. Operational errors/deviations accounted for 29 percent of incursions; vehicle/pedestrian deviations were the lowest fraction at 16 percent. (See Figure 1)
　
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本文鏈接地址：National Runway Safety Plan 2009-2011(6)