Light trails can be easily created with paths and outer glows. Here we used light trails on a highway shot to mimic a long exposure effect
Start with Levels to darken the scene. Make a duplicate and apply a 70-pixel Motion Blur at a 35-degree angle.
Add a layer mask and fill it with black, then selectively apply using white and a soft brush.
Duplicate the background again and use a similar process, this time applying a 12-pixel Gaussian Blur to obscure the landscape.
Set the Brush to 3px Diameter, 100% Hardness, and 100% Opacity. Using the Pen tool, create a path for the first white light trail, naming it in the Paths palette to save it.
Make a corresponding layer, set the foreground colour to white, and then click ‘Stroke path with brush’ at the bottom of the Paths palette. Finally, apply a white Outer Glow to complete the trail.
Create the other light trails using the same steps, making each with a new path on separate layers. For the red lights, set the foreground colour and Outer Glow to red.
To introduce some yellow, add a yellow Fill layer set to Overlay, filled its mask with black, then selectively apply with white. A Vibrance adjustment layer can help make the colours pop.