| Design Element | Description | 2026 FDM (or Other) | ||
|---|---|---|---|---|
| Grade Change W/O Vertical Curve | 0.7% | 0.7% | 1% | Table 210.10.2 |
| Min K Value – Sag Curve – Crest Curve | 79 98 | 79 98 | 37 31 | Table 210.10.3 |
| Min Curve Length – Sag Curve – Crest Curve | 135 135 | 135 135 | 90 90 | Table 210.10.4 |
| Stopping Sight Distance (Min) | 400 ft | 400 ft | 215 ft | Table 210.11.1 |
| Deceleration Length for Exit Ramp | -- | -- | 385 ft | Table 211.13.1 |
| Bridge | ||||
| Proposed Express Lanes | DeSoto | Other* | ||
| Travel Lane Width | 15 ft | 11-12 ft | 11-12 ft | Figure 260.1.1, 260.1.4 |
| Shoulder Width – Median – Outside – Buffer | 6 ft 6 ft -- | 8 ft 8 ft 4 ft | 8 ft 8 ft 4 ft | Figure 260.1.4 Section 260.3 Section 211.3.3 |
| Min Clearance – Over Roadway – Over Railroad – Over Waterway | 16.5 ft 23.5 ft -- | -- -- MHW + 6 ft | 16.5 23.5 -- | Table 260.6.1 Table 260.6.1 Section 260.8.1 |
| * Other bridges: SR 55 over US 301 and SR 55 over CSX RR (immediately north of US 301) | ||||
| Sidewalk / Shared use Path | ||||
| Sidewalk | Shared use Path | |||
| Width | 6 ft | 12 ft | Table 222.2.1, Section 224.4 | |
| Offset From Roadway (Min) | 5 ft* | 5 ft | Section 222.2.1.1, 224.12 | |
| Vertical Clearance | 7 ft | 12 ft | Section 222.2.1.2, 224.8 | |
| Longitudinal Grade (Max) | 5% | 5% | Section 222.2.1.3, 224.6 | |
| Horizontal Clearance | 1-2 ft | 4 ft | Section 222.2.1.3, 224.7 | |
| Design Speed | -- | 18 mph | Section 224.9 | |
| Horizontal Curve (Min Radius) | -- | 74 ft | Table 224.10.1 | |
| * Offset applies if plantings and street furniture are considered. Offset is measured from back of curb. | ||||
Structural Design Criteria:
Note: During the Speed Selection process with District 1 early 2026, it was agreed that the target and design speed for the Preferred Alternative is 45 mph (except for the at-grade portion between 13th Ave East and westbound SR 64 where the design speed will be 40mph). This is consistent with the existing design speed from 9th Street East to westbound SR 64, however it reduces the current 50 mph design speed by 5 mph north of westbound SR 64.
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