AI Dev Tool: How do traffic signals

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Preview Code

```python
# AI Dev Tool: Traffic Signal API with FastAPI and Pydantic
# Description: A production-ready API for managing traffic signals
# Category: Production Starter Boilerplate
# Author: Elite Software Architect

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel
import random
import uvicorn

# Define the traffic signal model
class TrafficSignal(BaseModel):
    """Traffic signal model"""
    id: int
    location: str
    status: str  # "red", "green", or "yellow"

# Define the traffic signal API
app = FastAPI()

# Initialize the traffic signal data store
traffic_signals = [
    TrafficSignal(id=1, location="Main St", status="red"),
    TrafficSignal(id=2, location="Elm St", status="green"),
# ... full runnable version includes tests & documentation