Speed limit here drops, southbound, to 55 mph

Speed limit here become 65 mph, westbound

Another 55 mile per hour speed limit sign here.

Speed limit once again marked as 55 miles per hour, westbound on 421.

Speed limit 65 mile-per-hour here.

Another 65 miles per hour sign here.

Roads here appear to be marked with some incorrect zigzagging. Heading north, the navigation service (on OsmAnd+, at least) attempts to have you avoid the problem by directing you to the exit ramps as a sort of bypass.

Stoplight here; turn left to get back on 421 heading west.

Left Ln. ends / merges into right lane due to construction.

Still 65 mph heading west on 421.