Here's a Python script that creates 200 curves in Blender 3.4.1 that overlap and combine to look like a road network:
```py
import bpy
import random

# Set the number of curves to create
num_curves = 200

# Set the size of the road network
size = 20

# Set the height of the road network
height = 0.5

# Create an empty list to hold the curves
curves = []

# Create the curves
for i in range(num_curves):
    # Create a new curve
    curve = bpy.data.curves.new('Curve', 'CURVE')
    curve.dimensions = '3D'
    spline = curve.splines.new('BEZIER')
    
    # Set the start and end points of the curve
    start = (random.uniform(-size, size), random.uniform(-size, size), height)
    end = (random.uniform(-size, size), random.uniform(-size, size), height)
    spline.bezier_points.add(2)
    spline.bezier_points[0].co = start
    spline.bezier_points[1].co = (start[0] + random.uniform(-size/2, size/2), start[1] + random.uniform(-size/2, size/2), height)
    spline.bezier_points[2].co = end
    
    # Add the curve to the scene
    obj = bpy.data.objects.new('Curve', curve)
    bpy.context.scene.collection.objects.link(obj)
    curves.append(obj)

# Combine the curves into a single object
bpy.ops.object.select_all(action='DESELECT')
for curve in curves:
    curve.select_set(True)
bpy.context.view_layer.objects.active = curves[0]
bpy.ops.object.join()

# Convert the curves to a mesh
bpy.ops.object.convert(target='MESH')
```

This script creates 200 curves with random start and end points, and then combines them into a single object that looks like a road network. The size and height of the network can be adjusted by changing the size and height variables.
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