We have a blog post on the topic which includes some suggested alternates that might include some of the routing you are already discussing.
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Go to the ACA Routes main Page > Maps Section >Green Mountains Loop (right side of page). Then click on the "GPS" section near the top of the Green Mountain Loop section summary. That will take you to the GPS data page. Be sure you are logged in to be able to download the info.
The U.S. Marine Corps is planning to close the Camp Pendleton Bike Path—the only bike access between Las Pulgas Rd. and Basilone Rd. along Interstate 5 (I-5)— for military operations between this Monday, Jan. 25 and Friday, Jan. 29, 2016. Under normal bike path closure circumstances Caltrans would open the freeway shoulders in this segment to bicyclists, however there is a construction project that has closed the shoulders of I-5 in that segment. Caltrans will provide a 24/7 on-call shuttle for bicyclists to pass through the closures in the I-5 corridor between Oceanside and San Clemente. The phone number for the shuttle is (619)385-3267. There will be pick-up locations at the Las Pulgas Rd. parking lot for northbound cyclists, and at the south end of the Old Hwy. 101 bike path at Basilone Rd. for southbound cyclists. Those locations will serve as drop-off locations for the opposing directions of travel. Signs at both locations will include the shuttle phone number. Please share this information and make your plans accordingly. We apologize for any inconveniences in advance.
The first, and probably easiest, has you leave the current route at St Augustine (if you are going north) and head over toward Green Cove Springs on SR 16/SR13, then up the east coast of Lake George and the St Johns River on Madrid Ave. This is shown as a high traffic road on our Bicycle Friendly Roads app, but it is the preferred route of the local cycling club. I expect they are using it during off-peak traffic times, and apparently folks on this route are used to seeing cyclists.
You cross into downtown Jacksonville on the Acosta Bridge, then take Main Street/US 17 north to rejoin the existing bike routes. Main Street/US 17 is a multilane road, and there are bike lanes north of the railroad tracks (we need to reflect this on the website) but not south of the RR tracks. Cyclists can take the outside lane, or they could use one of the smaller parallel residential streets instead (that’s what I’d probably do.) You can see these on the website.
The second alternative would be to continue north to US 90/Beach Blvd, due east of Jacksonville, and ride that west toward Jacksonville. US 90 has spotty bike lanes most of the way in, but as you get close to town you’ll want to jump off onto the local grid and connect to the Acosta Bridge, then it’s north on 17 as described above.
Greetings Bicycling Community --
...Many of you may be aware that a FULL closure of southbound (SB) Camino del Mar (aka Hwy. 101/SR 21) is in effect in the City of Del Mar between Del Mar Heights Rd. and Carmel Valley Rd. This closure is expected for 1-2 months. Northbound traffic is still allowed in this segment, including bicyclists-- of course. A detour has been established for SB vehicles-- SB Camino del Mar to eastbound (EB) Del Mar Heights Rd./4th St. to I-5 SB to westbound (WB) Carmel Valley Rd. and then back to SB Camino del Mar (Hwy. 101).
There are several options for bicyclists to detour around the closure. One that has been established for bicyclists is the shortest route which follows 4th St./ Del Mar Heights Rd eastbound to Mango Dr./ Portofino Dr. and then to WB Carmel Valley Rd. to Camino del Mar. Extreme grades are present along that detour. There are other routes available including EB Via de la Valle to SB El Camino Real to WB Carmel Valley Rd.-- a route that includes less intense grades than the proposed detour, but may not include dedicated bike lanes in all segments. Vigilance by all cyclists is advised in all cases. It should be noted that wrong-way driving on a bicycle is dangerous and against the California Vehicle Code. Detours should be followed and all cyclists should adhere to California Code.