What is the difference between Priority Sign 2.6 (circular with red border, black arrow going down and red arrow going up) and Priority Sign 2.7 (blue square with white arrow going up and red arrow going down)?

1. Sign 2.6 grants priority over oncoming traffic; Sign 2.7 gives priority to oncoming traffic.
2. Sign 2.6 requires yielding to oncoming traffic on a narrow road section; Sign 2.7 grants priority over oncoming traffic.
3. Both signs indicate a dead-end street.
4. Sign 2.6 applies to trucks only; Sign 2.7 applies to cars only.