WEBVTT

00:00:00.000 --> 00:00:01.000
VCI: ratings to a calculated index. Four assessed defects; all other items assessed absent. K = 2,534.1667 for the full default item list.

00:00:01.000 --> 00:00:07.000
MATHEMATICS · define the relationship and the meaning of each symbol before calculating.

00:00:07.000 --> 00:00:14.000
D: degree; E: extent rating; Y: extent exponent; W: defect weight. S: small-degree factor; M: cap (25 other, 12 functional); K = 2,534.1667. Selected method: Draft TRH22 (1994), Addendum A.3; all other defects assessed absent.

00:00:14.000 --> 00:00:26.600
INPUTS · blue is degree D; mustard is extent E. Both are ratings; neither is a percentage.

00:00:26.600 --> 00:00:33.600
Extent is a rating, not a percentage. Functional extent is fixed at 3. Rutting at D = 2 uses S = 0.5.

00:00:33.600 --> 00:00:46.600
CALCULATION · raise the extent rating to Y, apply the cap, then multiply by W and S.

00:00:46.600 --> 00:00:55.600
INTERMEDIATE OUTPUT · weighted defect contributions · read the axis units and the numerical values.

00:00:55.600 --> 00:01:13.600
Sum F = 219.0694; K = 2534.1667. K includes all items, not only these four.

00:01:13.600 --> 00:01:22.600
OUTPUT TRANSFORMATION · preliminary P to final VCI · read the axis units and the numerical values.

00:01:22.600 --> 00:01:27.600
The mapping is nonlinear: P = 50 gives VCI = 12.25; P = 100 gives 100. P and VCI are not interchangeable.

00:01:27.600 --> 00:01:36.600
SENSITIVITY · change rutting degree only · read the axis units and the numerical values.

00:01:36.600 --> 00:01:51.600
D = 2 → 3 removes the small-degree reduction: rutting contribution rises 24 → 72; VCI falls 75.02 → 70.23.

00:01:51.600 --> 00:02:04.500
ONE ROW · Why does a one-step change in a rating sometimes move the index much further than the previous step?

00:02:04.500 --> 00:02:14.500
PARAMETER MAP · 36 evaluated cells. The colour limits stay fixed across every row.

00:02:14.500 --> 00:02:23.759
All 36 cells are valid integer combinations of rutting degree and extent. Other active contributions remain cracking 125.13502533, potholes 36.93433240 and riding quality 33; K

00:02:23.759 --> 00:02:34.500
remains 2,534.1666667. The final transform is VCI = (0.04P + 0.0006P²)². Crossing degree two changes the small-degree factor as well as D. Follow one extent row to separate those

00:02:34.500 --> 00:02:39.500
effects.

00:02:39.500 --> 00:02:51.500
VALUE LANDSCAPE · Height and colour encode Final VCI. This is a graph over the two input axes, not automatically a physical pavement shape.

00:02:51.500 --> 00:02:59.917
Discrete draft TRH22 A.3 example with the method interpretation described above. No fractional ratings or interpolated response surface is implied. Other defects are explicitly assessed absent, not missing.

00:02:59.917 --> 00:03:05.333
Specified Draft TRH22 (1994) A.3 variant. Confirm the adopted method and assessment mapping for each project.