Riddle: I am a protector and I sit on a bridge; one person can see right through me while others wonder what I hide. What am I?

Introduction / Context:
This riddle again uses metaphor and double meaning. The “bridge” in the description is not a river crossing but the bridge of a nose. The object protects something, allows the wearer to see through it, and may cause others to wonder what is hidden. Such riddles test whether the reader can recognise playful language and relate descriptions to familiar everyday objects.

Given Data / Assumptions:

• The object is a “protector”.
• It “sits on a bridge”, which suggests the bridge of the nose.
• One person (the wearer) can see through it.
• Other people may wonder what is hidden behind it.
• Answer choices include Sunglasses, Traffic barrier, Guard dog, and Bridge lamp.

Concept / Approach:
Sunglasses protect a person's eyes from bright sunlight and sometimes from being easily read by others. They literally sit on the bridge of the nose and rest on the ears. The wearer can see through the lenses, but people looking at the wearer may not clearly see the eyes and may wonder about the person's emotions or intentions. This fits every part of the riddle very closely.

Step-by-Step Solution:
Step 1: Interpret “bridge” as the bridge of the nose, not a physical road bridge. Step 2: Identify objects that protect and are worn on the face, such as glasses and sunglasses. Step 3: Notice that sunglasses both protect the eyes and allow the wearer to see through tinted lenses. Step 4: Observe that other people may not see the wearer's eyes clearly, so they may wonder what emotions or expressions are hidden. Step 5: Conclude that “Sunglasses” is the best fit among the options.

Verification / Alternative check:
Traffic barriers sit on road bridges or at entrances but are not transparent and do not allow someone to see through in a personal sense. A guard dog can protect but does not sit on any “bridge” and cannot be seen through. A bridge lamp is simply a light fixture and does not fit the clues about protection and transparency. Only sunglasses are worn on the nose bridge and function as a protector while being see-through for the wearer.

Why Other Options Are Wrong:
“Traffic barrier” refers to a fixed road safety structure and lacks the personal, eye related context. “Guard dog” is protective but does not sit on a bridge or allow someone to see through it. “Bridge lamp” is an object on a bridge but has nothing to do with hiding or showing a person's eyes. These options fail to satisfy the combined clues about protection, placement, and transparency.

Common Pitfalls:
Many learners initially interpret “bridge” literally as a structure over water and become stuck on physical bridges, losing sight of the figurative use. Another pitfall is ignoring the phrase “see right through me”, which strongly suggests transparent or semi transparent material. Recognising the nose bridge meaning quickly directs you to glasses or sunglasses.

Final Answer:
The object is a pair of Sunglasses.