- No Build Alternative
- Transportation Systems/Demand Management (TSM/TDM) Alternative
- Freeway/Expressway Alternative (Avenue P-8, I-15 and SR-18) (With 4 Variations)
- Freeway/Tollway Alternative (Avenue P-8, I-15 and SR-18)
- Freeway/Expressway Alternative with High Speed Rail Feeder Service
- Freeway/Tollway Alternative with High Speed Rail Feeder Service
- Hybrid Corridor Alternative
The No-Build (No Action) Alternative is exactly as it sounds – it proposes that no new corridor be built. Simply, the No-Build alternative represents future travel conditions without the HDC project, and is the baseline against which the other alternatives are measured.
The TSM/TDM alternative proposes a collection of several smaller, lower cost roadway improvements throughout the project area, rather than a singular large, new corridor. The TSM/TDM alternative focuses on making minor improvements that would connect SR-14 with SR-138, and then extend east to connect with US- 395, I-15 and SR -18. These smaller elements would include:
- An eight-lane grade-separated freeway from SR-14 to 30th St East.
- A transition to a four-lane at-grade expressway from 30th St East to Longview Rd.
- A four-lane at-grade highway connecting to SR-138 and extending east to US-395 along SR-18.
- A six-lane arterial highway along SR-18 (Palmdale Rd) from US -395 to I-15.
- Minor roadway and signal improvements along SR-18 from I-15 to Bear Valley Rd.
Except for the freeway portion between SR-14 and 30th St East, these TSM/TDM roadway improvements would maintain at-grade intersections with local roads and driveway access.
This Alternative consists of a combination of a controlled-access freeway and an expressway. It generally follows Avenue P-8 in Los Angeles County, and south of El Mirage Rd in San Bernardino County, later extending to Air Expressway Rd near I-15 and curving south to terminate at Bear Valley Rd. This alternative, unlike the previous two, will also consider incorporation of green technologies and a new bike route.
There are four slight variations that are being considered for this alternative, each representing a difference in how the freeway/expressway would curve and bend throughout the alignment:
- Variation A
- Near the City of Palmdale, the freeway/expressway would dip slightly south of the main alignment, approximately between 15th St East and Little Rock Wash.
- Variation B (south)
- East of the county line, the freeway/expressway would flare out slightly south of the main alignment between Oasis Rd and Coughlin Rd.
- Variation D
- Near the community of Lake Los Angeles, the freeway/expressway would dip slightly south of the main alignment, just south of Avenue R approximately between 180th St East and 230th St East.
- Variation E
- Near the cities of Adelanto and Victorville, the freeway/expressway would dip south of the federal prison.
This Alternative follows the same physical alignment as the Freeway/Expressway Alternative with the addition of sections of the alignment operating as a tollway. The incorporation of green energy technologies and a bike route will also be considered.
This Alternative is the same as the Freeway/Expressway Alternative, with the addition of a High Speed Rail (HSR) Feeder Service between Palmdale and Victorville. The incorporation of green energy technologies and a bike route will also be considered in this alternative.
This Alternative is the same as the Freeway/Tollway Alternative, with the addition of a High Speed Rail (HSR) Feeder Service between Palmdale and Victorville. The incorporation of green energy technologies and a bike route will also be considered.
This Alternative would consist of a combination of all of the previously identified alternatives – resulting in a solution that is pieced together to best fit the needs of each section of the corridor. The determination of which elements to use, and at which locations, would be based on the results of the traffic study, environmental studies, and public input.
Further details on the alternatives are available at the project website, metro.net/hdc.