What type of sign is this? 

What does this sign mean?

When changing lanes on an expressway, the driver should turn on the turn signal in advance, observe the traffic conditions, and enter the new lane after making sure it is safe to do so

When driving at night, the drivers observation ability is visibly poorer and his visibility range becomes shorter than driving in the daytime

When driving at night on a narrow road or bridge and crossing another vehicle how should lights be used? 

A motorized vehicle driver who drives after drinking alcohol receives what penalty?

What does this sign mean?

The traffic police may detain the motorized vehicle according to law in which situation? 

When driving in a rainy day, what should the driver do when a pedestrian holding umbrella or in raincoat is walking on the highway?

What does this sign mean?