The traffic signs with arrows pointing downwards are as follows:
1. No downward driving sign: the white arrow on the red background points downward.
2. Warning slope sign: The black arrow on the yellow background points downward.
3. Warning bridge sign: The black arrow on the yellow background points downward.
4. Warning sign of uneven road surface: The black arrow on the yellow background points downward.
The eight-character arrow points to the traffic sign below, which is mainly used to indicate that vehicles are prohibited from passing or to warn vehicles to pay attention to the road conditions and the scenery below.