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C G-a 15

1

2

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120 m

75

120 30 25

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-1

-2

-3

Paint Veiw

LCC

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15-3

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-2A

-1 a-115

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-4 c-111

R3

cc-1

-4

2) A-4

11.7 16

NEXCO

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-5

1 3

NEXCO

-6

a-1 a-2 MIO b-1 b-2 MIOa b

-5 20 C

-6

-5

c-31

c-33

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c-13

c-31

15

c-33

15

-13

10

c-13

10

NEXCO 5 15300 1

20 60 70

NEXCO

NEXCO 20

5km -7-3

-4 1-6

3 1

2007 JIS7 8

21 NEXCO

-3

-7

2007 JIS

3

-4

-5

R

-7

-5

-6

-7 -8

-8

1 2C

2 -8

a. b. c. d.

e. f.

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600 m 1000 m-9

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95dB120dB

75dB

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-10

(1)(2)(3)

NEXCO

1)11 2008.8

2) Paint ViewEXTEC No.64 2003

3) Vol.92 No.10 2007.104) Vol.93 No.1 20085)

2008.5.16 http://www.mlit.go.jp/road/ir/ir-council/maintenance/index.html6) 2007.12 7) 2009.78)

Vol.28 1991