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.
Regulatory Traffic Signs. At SafetySign.com we grouped the most popular Regulatory Traffic Signs for your ease of purchase. From a No U Turn Sign to One Way Signs weâve put together a small collection of MUTCD compliant Signs that you are most likely to need in your Parking Lot or on your Town street.