No. You would only be required to disclose if asked. You can disclose, but there is no manadate. Remember a handgun in your vehicle must be concealed. If an officer asks if you have a firearm, then you can produce your license and explain the firearm is concealed in your vehicle. While it is "recommended" there is no law to reveal that information.
This is directly from the Texas Deparment of Public Safety website
Traveling on Texas Roadways with Concealed Handguns
Traffic stop policies vary among law enforcement agencies. Your local police department or sheriff's office can tell you what to expect if stopped while carrying a handgun within their jurisdictions.
Texas Department of Public Safety troopers will ask you:
- Whether you are licensed to carry a concealed handgun
- Whether you have the gun with you
- Where the gun is located
A trooper may disarm a licensee anytime he or she feels that safety is at risk. The trooper will return the gun at the end of the traffic stop when the threat to safety has passed.
When stopped by a law enforcement officer, DPS recommends that you:
- Keep your hands in plain sight
- Cooperate fully with the police officer
- If you have a gun with you, tell the officer as soon as possible
- Don't make any quick movements, especially toward the weapon
- At night, turn on your vehicle's dome light
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