Speeding and reckless driving without Code 3 will be the most common. Good luck.
Everyone does this. Everyone including: Firemen, Paramedics, FBI, SAPD, and others.
Also this, About 50% of all emergency service personnel always use the incorrect ramp going either Code 3 or no Code 3 at any given freeway interchange in San Andreas. The most common ones are: Mulholland Interchange, Montgomery Interchange, and the Southwest Interchange in the Las Venturas Beltway.
There should be implanted traffic signal on the highway ramps. People must be aware of the actual entrance.
That would be very nice, but I highly doubt that everyone would pay attention to them unless there's a cop stationed there 24/7.