to go [back] into (a lane)
http://www.dict.cc/?s=einscheren

may be an alternate expression.

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Note added at 1 day23 hrs (2016-04-01 14:15:10 GMT) Post-grading
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Da ich auf einer Reise war, konnte ich erst nach Rückkehr intensiver nach einem möglicherweise besseren Ausdruck forschen.

Fazit: Don't weave, but merge!

Weave in and out (of something)
Fig. to move, drive, or walk in and out of something, such as traffic, a line, etc. The car was weaving in and out of traffic dangerously.
weave in and out
Move by twisting and turning or winding in and out, as in The motorcycle wove in and out of traffic, leaving us far behind.
http://idioms.thefreedictionary.com/weave in and out

Merging
When entering a freeway or motorway from an on-ramp you should merge like a zip: match your speed to that of the traffic on the freeway and look for a gap to slot yourself in. If you are following other vehicles onto the freeway don’t force yourself into the line of traffic. Merge one-by-one, allowing other vehicles on the freeway enough time to adjust their position. If you try to merge more slowly than the cars on the freeway you create a dangerous situation as vehicles on the freeway will need to brake to adjust to your speed. This increases the risk of nose-to-tail accidents and slows all traffic up, i.e. by merging slowly you contribute to traffic congestion.
When two roads merge into one road, the vehicle that has to cross the lane line must give way.
If two lanes merge into one without a lane line, the vehicle that is ahead has right of way.
http://www.driverknowledgetests.com/resources/intersection-r...

The world can be divided into two kinds of drivers: Those that get over into a lane to exit or merge early (lineuppers) and those that zoom by until the last moment (sidezoomers), cutting the line in a sense. The war between lineuppers and sidezoomers is part of what makes driving hell sometimes. It turns out, we're all doing it wrong.
You see this in play whenever there are many cars on the road and a lane is closed, ends soon, or there's a busy exit. Lineuppers (as the The New York Times calls them), dutifully slow down and move over into the appointed lane, taking their places. When sidezoomers zip past those who are lined up and try to sidle in at the front, many lineuppers get angry and refuse to let (those cretins, in their minds) in. Then the second lane gets backed up too and we have on our hands a bottleneck.
http://lifehacker.com/the-right-way-to-merge-lanes-to-avoid-...

3.15 Turning
Right turns
When approaching an intersection or driveway that requires a right-hand turn, move as close to the right curb or right edge of the road as possible.
General procedure:
1. Decide to make your right turn well in advance of the turn. Signal, check your rear gate and check your blind spot. When safe, move as close to the right as possible.
2. Check for traffic, pedestrians and other real or potential hazards in or near the intersection. A basic left, straight ahead, right, left sweeping pattern will be sufficient.
3. Slow down (and shift to a lower gear if you are in a manual transmission vehicle).
4. Check again for real or potential hazards.
5. If there are no potential hazards, complete your right turn into the first available driving lane
https://www.sgi.sk.ca/individuals/licensing/studyguides/driv...

Many roads have two or more lanes going in your direction. These lanes are separated by broken white lines. You must choose which lane to use. Drive in the lane that has the smoothest flow of traffic.
If you can choose among three lanes on your side of the road, pick the middle lane for the smoothest driving. If you want to go faster, pass, or turn left, use the left lane. When you drive slowly, enter, or turn off the road, use the right lane.
If only two lanes go in your direction, pick the right lane for the smoothest driving.
Don't Weave—stay in one traffic lane as much as possible. Before changing lanes, check your mirrors for vehicles that may be ready to pass you; also turn your head and CHECK BESIDE YOUR VEHICLE to see if any vehicle, such as a motorcycle, is in your blind spot and to be sure there is enough room for your vehicle in the next lane.
Once you start through an intersection, keep going. If you start to make a turn, follow through. Last second changes may cause accidents. If you missed a turn, continue to the next intersection and work your way back to where you want to go.
http://pages.cs.wisc.edu/~gdguo/driving/UseofLanes.htm

Drive in the lane with the smoothest flow of traffic. If you can choose among three lanes, pick the middle lane for the smoothest driving. To drive faster, pass, or turn left, use the left lane. When you choose to drive slowly or enter or turn off the road, use the right lane.
If there are only two lanes in your direction, pick the right lane for the smoothest driving.

Do not weave in and out of traffic. Stay in one lane as much as possible. Once you start through an intersection, keep going. If you start to make a turn, follow through. Last minute changes may cause collisions. If you miss a turn, continue until you can safely and legally turn around.

Changing Lanes
Changing lanes includes:
• Moving from one lane to another.
• Entering the freeway from an on-ramp.
• Entering the road from a curb or the shoulder.
https://www.dmv.ca.gov/portal/dmv/detail/pubs/hdbk/traffic_l...