Why is silica sand (usually 30 to 60 mesh) added to asphalt sealcoat mix designs for commercial parking lots?

1. To make the sealcoat dry to a bright glossy white reflective finish for decorative purposes.
2. To eliminate the need for applying a second coat of sealcoat material.
3. To lower the melting temperature of asphalt binder during application.
4. To increase surface traction, improve skid resistance, and fill minor voids.