Making more progress in mapping Foster City, CA (USA), it's become evident that when creating ways of roads with bridges or tunnels (or any other segment that needs to be tagged in another way), it's easier to make the whole road one contiguous way, tag it with the correct highway type and street name, and then go back later to add in any bridges.

Insert any points needed to make the bridge begin and end at the right place, and then split the way on each side of the bridge, and then add the bridge and layer tags to the newly created way.

I've set out to map my home town, Foster City, and use it as a means to create a better tutorial for data collection and editing.

The city has a fair number of attributes that make it a suitable crucible, including pedestrian/bike paths, undivided residential streets that suddenly change names or become divided, lagoons, parks, bridges, coastline (SF Bay), and a state highway that runs through it.

First tip: Setting my GPS tracklog to capture every 2 seconds seems to work well for capturing just the right amount of detail. It's just barely enough, for instance, to create a slight knot in the track at stop signs (so long as you're not making a California stop!), to aid in determining where to place a point in the intersections.