Merging two traffic streams into one lane is one of the most difficult parts of driving.
DO NOT STAY NEXT TO ANOTHER VEHICLE.
Always leave space directly to the front and sides of your vehicle.
WRONG
RIGHT
ALWAYS OBEY THESE RULES FOR MERGING NO MATTER WHAT SIGNS ARE THERE.
Being selfish makes drivers brake hard and slows down all traffic.
Those in front should have priority over those behind. This is taking turns.
The MERGE sign is a command to do this.
Leave room for merging traffic to enter.
NEVER SPEED UP to keep vehicles from merging in front of you.
Alternate positions so there is room to merge (as in the second image above). Take turns.
Leave more room for merging traffic to enter.
The merge lane is not long enough for drivers to suddenly select other gap openings.
You need precise throttle control to match the gaps in the other stream.
Your vehicle is too long for a merging driver to find a safe gap. This includes semis.