The Basic Speed Law Doesn't Say Anything About Speed Limit Signs

California's Basic Speed Law: Why the Posted Speed Limit Is Not Always a Defense

California's basic speed law requires drivers to operate at a reasonable and prudent speed for the circumstances, even when they are traveling at or below the posted speed limit.

Many California drivers assume that if they are driving at or below the posted speed limit, they cannot be considered speeding or negligent. That is not necessarily true. California Vehicle Code § 22350, commonly known as the basic speed law, requires drivers to operate at a speed that is reasonable and prudent under the circumstances, taking into account factors such as traffic, road conditions, visibility, and other surrounding conditions.

I learned this lesson firsthand in a case I handled several years ago. My client was attempting to make a left turn at a congested intersection when vehicles in the lanes traveling in the opposite direction stopped to allow him to turn. A woman traveling in the curb lane continued through the intersection at approximately 35 miles per hour—the posted speed limit—and collided with my client with enough force to cause his vehicle to flip over twice.

Key Takeaways

• Driving the posted speed limit does not automatically establish that your speed was reasonable.
• California's basic speed law, Vehicle Code § 22350, requires drivers to travel at a reasonable and prudent speed under the circumstances.
• Traffic conditions matter. A speed that is reasonable on an open road may be unreasonable where traffic has stopped or conditions have changed.
• The posted speed limit is generally a maximum lawful speed under ordinary conditions, not a guarantee that traveling that speed is always safe.
• Drivers should pay attention to stopped traffic, pedestrians, visibility, road conditions, congestion, and other circumstances that may require them to slow down.
• A driver can potentially share responsibility for an accident even if another driver also made a mistake.
• Comparative fault allows a jury to assign different percentages of responsibility among the parties based on the evidence.
• In a collision, evidence concerning traffic conditions, vehicle positions, speed, braking, photographs, witnesses, and accident reconstruction may all become important.

What Is California's Basic Speed Law?

California Vehicle Code § 22350 provides, in substance, that a person may not drive a vehicle at a speed greater than is reasonable or prudent, having due regard for weather, visibility, traffic, and the surface and width of the highway, among other circumstances.

The important point is that California's basic speed law focuses on the circumstances surrounding the driving, not merely the number printed on a speed-limit sign. A driver traveling 35 miles per hour may be driving appropriately on one road but too fast for the conditions on another road—or even too fast for changing conditions on the same road.

Is the Posted Speed Limit Always a Safe Speed?

No. A posted speed limit does not mean that the driver is entitled to travel at that speed regardless of what is happening around them. Drivers have an ongoing obligation to operate their vehicles safely and to adjust their speed when circumstances require it.

For example, imagine that the posted speed limit is 35 miles per hour, but traffic in several adjacent lanes has suddenly stopped. A driver who continues through the remaining open lane at 35 miles per hour may have difficulty explaining why that speed was reasonable if the surrounding traffic was signaling that something unusual or dangerous was occurring ahead.

My Jury Trial Involving the Basic Speed Law

I handled a case several years ago that illustrates this principle particularly well. My client was attempting to make a left turn at a congested intersection, and vehicles in the lanes approaching from the opposite direction had stopped to allow him to complete the turn. A woman traveling in the curb lane continued through the intersection at approximately 35 miles per hour and struck my client's vehicle.

The impact was substantial. My client's vehicle flipped over twice, and the other driver subsequently sued him, arguing that he had made an unsafe lane change. There was certainly evidence supporting her position, and we did not try to pretend that my client had done everything perfectly. Instead, we argued that her conduct also contributed to the collision, because she continued traveling at the maximum posted speed even though the surrounding traffic had stopped.

How Did the Jury Find the Other Driver Partially Responsible?

Our argument was not simply that the other driver was traveling 35 miles per hour. The important issue was whether 35 miles per hour was reasonable under the circumstances. When multiple vehicles to a driver's left have stopped in a congested intersection, that unusual traffic pattern can provide a warning that something may be happening ahead and that the driver should exercise additional caution.

The jury ultimately accepted our argument to a significant degree. Although my client had been accused of making an unsafe lane change, the jury also found that the other driver had contributed to the accident and assigned her 35% of the responsibility. The case illustrates why simply saying "I was driving the speed limit" does not necessarily end the discussion about negligence.

Can You Be Partially at Fault Even If Another Driver Caused the Accident?

Yes. California generally follows a comparative negligence system, meaning that more than one person can potentially be responsible for causing an accident. A jury can evaluate the conduct of each party and assign responsibility according to the evidence presented at trial.

That can be particularly important in intersection accidents, lane-change cases, and other collisions where both drivers may have made mistakes. One driver may have violated a traffic rule while the other driver may have failed to react appropriately to the surrounding circumstances. The fact that one driver bears some responsibility does not necessarily mean the other driver bears none.

What Evidence Can Establish That a Driver Was Traveling Too Fast?

Evidence concerning speed and reasonableness can come from many sources. Witness testimony, photographs, traffic-camera footage, dashcam video, vehicle damage, skid marks, accident reconstruction analysis, traffic conditions, and the positions of the vehicles can all potentially help establish what happened.

Sometimes the most important evidence is not a precise measurement of speed but the circumstances confronting the driver. For example, evidence that traffic had stopped, visibility was limited, pedestrians were present, or road conditions were hazardous may help establish why a particular speed was unreasonable under the circumstances.

Does California's Basic Speed Law Apply Only When Someone Exceeds the Speed Limit?

No. That is one of the most important concepts to understand. A driver can potentially violate the basic speed law even while traveling at or below the posted speed limit if the circumstances make that speed unreasonable or unsafe.

Conversely, the fact that a driver was traveling below the posted speed limit does not automatically mean the driver was operating safely. The legal question can involve the totality of the circumstances, including what the driver knew or should have recognized about the conditions around them.

What Should You Do If the Other Driver Says, "I Was Only Going the Speed Limit"?

Do not assume that statement settles the issue. If the circumstances suggest that the driver's speed was unreasonable, preserve evidence concerning the traffic conditions, visibility, road configuration, location of the vehicles, and anything else that may explain why the driver should have slowed down.

Photographs and video can be particularly valuable. If other vehicles had stopped, traffic was congested, or there was some other obvious warning that required caution, documenting those circumstances can help establish what a reasonable driver should have recognized at the time.

What Should I Do After a Santa Clarita Car Accident?

After a collision in Santa Clarita, Valencia, Saugus, Canyon Country, Newhall, Castaic, Stevenson Ranch, or elsewhere in Los Angeles County, try to preserve evidence concerning the circumstances of the accident. Photograph the intersection and surrounding traffic conditions when it is safe to do so, obtain witness information, preserve dashcam footage, and keep copies of any police or traffic collision reports.

If you believe the other driver was traveling too fast for the circumstances, don't focus exclusively on proving the driver's exact speed. Look at the bigger picture. Evidence showing why that speed was unreasonable under the circumstances may ultimately be more important than whether the driver was traveling one or five miles per hour above the posted limit.

Frequently Asked Questions

1. What is California's basic speed law?

California Vehicle Code § 22350 is commonly known as the basic speed law. It generally requires drivers to operate at a speed that is reasonable and prudent given the circumstances rather than simply relying on the posted speed limit.

2. Is driving the speed limit always legal in California?

Not necessarily. A driver may still be required to reduce speed when traffic, weather, visibility, road conditions, or other circumstances make the posted speed unreasonable or unsafe.

3. Can I be speeding even if I am driving below the posted speed limit?

Potentially, yes. The basic speed law concerns whether the speed is reasonable and prudent under the circumstances, so the posted limit is not necessarily the only consideration.

4. What if the other driver says they were driving the speed limit?

That statement does not necessarily resolve whether the driver was operating at a reasonable speed. Evidence concerning traffic conditions, visibility, road conditions, and other circumstances may be relevant.

5. Can a driver be partially at fault for an accident even if another driver also made a mistake?

Yes. California's comparative fault principles allow responsibility for an accident to be divided among multiple parties when the evidence supports that conclusion.

6. How can I prove the other driver was driving too fast for the conditions?

Potential evidence can include witness statements, dashcam or surveillance video, photographs, vehicle damage, skid marks, accident reconstruction evidence, traffic conditions, and other evidence showing what was happening when the collision occurred.

7. Does the basic speed law apply at intersections?

Yes. Intersections can present circumstances that require drivers to exercise additional caution and potentially reduce their speed, particularly when traffic is congested, visibility is limited, or other vehicles have stopped.

8. What if traffic in the lanes next to me has stopped?

Stopped traffic may be an important circumstance indicating that you should exercise additional caution. Depending on the situation, continuing through an open lane at the posted speed may potentially be considered unreasonable if the surrounding traffic provides a warning of a hazard ahead.

9. Can a driver be partially responsible for an accident even if they did not violate the posted speed limit?

Yes. The issue under the basic speed law can be whether the driver's speed was reasonable under the circumstances, not simply whether the driver exceeded the numerical speed limit.

10. What should I document after an accident involving excessive speed?

Preserve photographs or video of the accident scene, traffic conditions, vehicle positions, road configuration, skid marks, signs, signals, and surrounding vehicles. Obtain witness information and preserve any available dashcam or surveillance footage as soon as possible.