data fw11p07; title 'Chapter 11, Exercise 7, pavament friction';
input  PAVE  $ TREAD    FRICTION    SPEED;
*** comment: FRICTION used for part c***;
cards;
ASPHALT1      1        0.35       36.5
ASPHALT1      1        0.35       34.9
ASPHALT1      2        0.35       40.2
ASPHALT1      2        0.35       38.2
ASPHALT1      2        0.35       38.2
ASPHALT1      6        0.35       43.7
ASPHALT1      6        0.35       43.0
CONCRETE      1        0.48       40.2
CONCRETE      1        0.48       41.6
CONCRETE      1        0.48       42.6
CONCRETE      1        0.48       41.6
CONCRETE      2        0.48       40.9
CONCRETE      2        0.48       42.3
CONCRETE      2        0.48       45.0
CONCRETE      6        0.48       47.1
CONCRETE      6        0.48       48.4
CONCRETE      6        0.48       51.2
ASPHALT2      1        0.24       33.4
ASPHALT2      1        0.24       38.2
ASPHALT2      1        0.24       34.9
ASPHALT2      2        0.24       36.8
ASPHALT2      2        0.24       35.4
ASPHALT2      2        0.24       35.4
ASPHALT2      6        0.24       40.2
ASPHALT2      6        0.24       40.9
ASPHALT2      6        0.24       43.0