When using pH test paper/indicator sticks you should also: 1  Make sure to only use paper/sticks that have not been previously wetted. 2  Wait for the color to stop changing (1-2 minutes maximum) before matching the paper/stick to the color key.
Red and White Regulatory Signs. Red and white regulatory signs tell you about regulations you must follow. For example, the DO NOT ENTER sign tells you there is danger ahead because vehicles will be coming toward you, usually on a freeway off-ramp or one-way street. The WRONG WAY sign may accompany the DO NOT ENTER sign.
Specific Information Logo Signs. Specific Information Logo signs (see Figure 3-13 for example) provide the driver with guidance for specific motorist services available at the approaching interchange. These signs are referred to as Specific Service signs in the Texas MUTCD and they are commonly known as Logo signs. The services eligible for Specific Information Logo signs are food, gas, lodging, and camping. Figure 3-13. Specific Information Logo sign.