|
Exhibit 4-28.
I-87/Alternate Route 7 interchange Weaving
Analyses |
|
Parameter |
Weave A |
Weave
B |
Weave C |
| AM Peak |
PM Peak |
AM Peak |
PM Peak |
AM Peak |
PM Peak |
|
Dataset 11 |
Dataset 12 |
Dataset 13 |
Dataset 14 |
Dataset 15 |
Dataset 16 |
| Weaving section length (feet) |
1,320 |
1,970 |
1,056 |
| Volume ratio,VR |
.30 |
.31 |
.70 |
.68 |
.76 |
.70 |
| Weaving ratio, R |
.35 |
.21 |
.36 |
.29 |
.32 |
.44 |
|
Speeds in weaving section (mph)
|
40.2
56.7 |
37.5
55.6 |
36.9
53.3 |
28.0
44.1 |
21.1
31.8 |
25.0
41.2 |
| Lanes required for unconstrained flow |
1.5 |
1.5 |
3.3 |
3.6 |
2.3 |
2.0 |
| Constrained or unconstrained flow? |
Constrained |
Constrained |
Constrained |
Constrained |
Constrained |
Constrained |
Weaving segment data
- speed (mph)
- density (pcpmpl)
- level of service
|
50.5
9.4
A |
48.9
12.5
B |
40.6
12.0
B |
31.7
38.2
E |
22.9
76.2
F |
28.4
35.4
E |
| Capacity (pc/hr) |
6,637 |
6,635 |
9,640 |
9,640 |
4,214 |
4,214 |
|
Model limitations |
| A: Does the weaving flow rate exceed the model
limit (the maximum allowable weaving flow rate)? |
No |
No |
No |
Yes |
Yes |
No |
|
B: Does the total flow rate in the section exceed the basic freeway
capacity? |
No |
No |
No |
No |
No |
No |
| C: Does the volume ratio, VR, exceed the model
limit? |
No |
No |
Yes |
Yes |
Yes |
Yes |
|
D: Type C constraint; not applicable here. |
- |
- |
- |
- |
- |
- |
| E: Is the weaving segment longer than 2,500
feet? |
No |
No |
No |
No |
No |
No |
|