To get long exposures in daylight, you need to cut much more light than ISO 100 and f/22 alone can handle. The usual solution is a strong neutral density (ND) filter, often around 10 stops, or multiple ND filters stacked together. That can turn a fast daylight exposure into several seconds, and shooting in early morning or late evening can extend exposure times even more.

A polarizer can reduce light a little, but usually not enough by itself, and it also changes reflections and contrast.

That said, daytime traffic won’t usually produce the same clean light trails as night shots. At night, headlights and taillights stand out against a darker scene. In daylight, moving cars tend to become soft, muddy streaks rather than bright trails.

If your goal is to show motion during the day, a better approach may be shorter exposures—up to about 1 second—to blur individual cars, or combining multiple short exposures in post-processing for a busier traffic effect.