fix some problems with Mulholland Dr
tweaks and note speed limit change on Owensmouth
post-redaction cleanup (fixed gaps)
post-redaction cleanup (fixed a link gap)
post-redaction cleanup and a few additions
post-redaction cleanup (fixed Balboa gap; fixed LA river gap)
post-redaction cleanup (fixed 405 crisscross)
post-redaction cleanup (restored highway tags)
post-redaction cleanup (restored Roxford St)
post-redaction cleanup (fixed a gap in I 5 northbound)
post-redaction cleanup (mostly missing highway=* and disconnected links)
post-redaction cleanup (Roxford St exits)