Editing Interstate 605 (section)

==Route description==
The entirety of I-605 is defined in the state highway system as '''Route 605'''. It is defined as such in the [[California Codes|California Streets and Highways Code]]'s section 619:<ref>[https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=SHC&sectionNum=619. California Code, SHC 619.]</ref>

<blockquote>
Route 605 is from:
<br />(a) [[California State Route 1|Route 1]] near [[Seal Beach, California|Seal Beach]] to [[Interstate 405 (California)|Route 405]].
<br />(b) Route 405 to [[Foothill Freeway|Route 210]] near [[Duarte, California|Duarte]].

Route 605 shall be known and designated as the “San Gabriel River Freeway.”
</blockquote>

The interchange with I-405 and SR 22 was built to accommodate an unconstructed future extension south to SR 1 as outlined in subdivision (a). The distance is traversable via nearby Seal Beach Boulevard, but Caltrans has no intention to adopt the road as part of Route 605.

The southern terminus of I-605 is at the [[Interstate 405 (California)|San Diego]] ([[Interstate 405 (California)|I-405]]) and Garden Grove ([[California State Route 22|SR&nbsp;22]]) Freeways in [[Seal Beach, California|Seal Beach]]. From there, it runs roughly north through the [[Gateway Cities]] of the [[Los Angeles Basin]]. It then shifts north-northeast, crossing the [[Whittier Narrows]] and across the [[San Gabriel Valley]]. I-605 then ends at its junction with the [[Foothill Freeway]], ([[Interstate 210 (California)|I-210]]) just south of the [[Irwindale, California|Irwindale]]–[[Duarte, California|Duarte]] border. Ramps from I-605 then extend north to [[Huntington Drive]] in Duarte.

I-605 follows most of the length of the [[San Gabriel River (California)|San Gabriel River]] from the San Diego Freeway in Seal Beach to the [[Santa Fe Dam Recreation Area|Santa Fe Dam]]. Typically dry riverbed and flood basins are visible from many portions of the route, especially near the northern terminus.

In the mid-2000s, a [[HOV lane]] was added for motorists with two or more people to use between I-405 and I-10. The HOV lane ends at I-10 and there are no plans to extend it to I-210 at this time. With the addition of the HOV lane, the left shoulder was eliminated to avoid massive costs to widen the freeway. The highway also suffers from traffic jams regularly, especially the junction with [[Interstate 5 in California|I-5]] (the [[Santa Ana Freeway]]). Newer signs with exit numbers replaced the older signs between the Orange County line and I-10 in 2016, with the completion of the I-605 and I-10 junction improvement. I-605 is one of the only Southern California freeways without destinations ([[control cities]]) such as "[[Seal Beach, California|Seal Beach]]" or "[[Irwindale, California|Irwindale]]" since its opening. Rather, cardinal directions ("NORTH" or "SOUTH"), and a simple "THRU TRAFFIC" designation in place of control cities, are used on signs along I-605 itself.

I-605 is part of the [[California Freeway and Expressway System]],<ref name="cafes">{{CAFESystem}}</ref> and is part of the [[National Highway System (United States)|National Highway System]],<ref name=fhwa-nhs>{{FHWA NHS map|region=losangeles|access-date=July 29, 2017}}</ref> a network of highways that are considered essential to the country's economy, defense, and mobility by the [[Federal Highway Administration]].<ref name=NHS-FHWA>{{FHWA NHS}}</ref> I-605 from I-405 to I-10 is known as the San Gabriel River Freeway, as named by Senate Bill 99, Chapter 1101 in 1967.<ref>{{CA Named Freeways | pages=96}}</ref>