asked to design, as a licensed PE — the proud steward of wisdom that, in some respects, dated all the way back to the ancient Romans, Greeks, and beyond. This might be my first solo project, but I was confident because I knew what I was talking about.
“Well, first we are going to correct deficiencies in the grade and in the alignment.”
“What does that mean?”
Safety is the primary responsibility of any licensed engineer. There really isn't a close second. It's written into our codes of ethics. It's embedded into our design processes. Safety is the reason why the state requires a license to practice engineering. It's why the city hired my firm for this job. It's why I was standing there.
If there was one single thing motivating me on this project, it was the desire to make this street safer.
“It means the grade and alignment of the street do not meet the standard, and so we are going to fix that.”
“What is the standard?”
My understanding of safety in this situation comes from accepted industry practice. Engineers have books of codes and standards that outline all aspects of safe design, from how wide to make a street to where to put the signs. I not only had access to these texts, I had been trained in how to interpret them properly.
I recognized that my role in this interaction was to simplify all of the complicated factors that go into designing a street — all of the institutional knowledge of my profession — into something that a layperson could understand.
“Basically, the street must be relatively flat and straight.”
“So, you are going to make the street flat and straight?”
“Yes.”
“How does that improve safety?”
My ability to stay friendly and professional here was important. The woman to whom I was speaking hadn't sat through the traffic engineering courses that I had taken — the ones that taught me the history of roadway design. She didn't know the horrible death rates of the early automobile era — the time before engineers established modern best practices.
She didn't have the training and the background that I had, including access to all of the code books and standards that my profession had developed over decades. She hadn't done the continuing education, sat around the table with my fellow engineers hearing the tales about how bad decisions led to bad outcomes and sometimes even death. I forced a half smile and went on.
“It will allow cars to navigate more smoothly, which makes it safer.”
“I don't understand.”
In traffic engineering, randomness is the enemy of safety. The more variables that we can remove, the more the driver can predict what is going to happen and the safer things become. For the driver, a road that is straight is safer than one with a lot of curves. A road that is flat is safer than one with a lot of hills.
It was difficult for me to explain something so self-evident, so I tried to expand the conversation to an aspect of design that would hopefully be easier to grasp — someplace where we could develop a common understanding and build to more complicated concepts.
“Along with fixing deficiencies with the grade and the alignment, we will be widening the driving lanes.”
“What will that do?”
“It will improve safety.”
“How does widening the lanes improve safety?”
Okay, this was getting frustrating. It is a little too obvious that wide lanes are safer than narrow lanes. Anyone who has tried to drive down a narrow street, having been forced to slow way down to avoid hitting things, knows that having more space gives the driver a higher safety margin. This was Road Design 101— the most basic of concepts. I was starting to think that this woman, despite her friendliness, just didn't want to get it.
“Along with fixing the deficiencies in the grade and the alignment, it will allow traffic to flow more smoothly.”
“What do you mean by allowing the traffic to flow more smoothly? How does that improve safety?”
“Cars will be able to move without worrying about hitting things, so it will be safer. That is why we are also expanding the clear zone.”
“What do you mean by expanding the clear zone?”
Having a clear zone on each side of the roadway is another one of these basic design concepts universally understood to improve safety. If a car goes careening off the road surface, all that kinetic energy needs to be dissipated. We don't want the car to be brought to an abrupt stop by hitting an obstacle; we want the process of slowing down to happen more gradually.
All traffic engineers have heard the story of a driver losing control, the car going off the road and hitting an obstacle that should never have been there, with tragedy being the predictable result. Establishing an area on each side of the road that is clear of obstacles increases the chance that people will walk away from such an incident. I was taught to insist on it. No compromises with safety.
“We will be removing obstacles from the clear zone to improve safety.”
“What is the clear zone?”
“It is the area on each side of the street that we need to keep clear of obstacles in case cars go off the road.”
“What kind of obstacles?”
“Mostly trees.”
I steadied myself because I had been in this situation before and knew what was coming. We were standing in a yard full of trees, many of which were going to be cut down. I knew she wasn't going to like that. It seemed a selfish reaction to me.
Most people seem to want progress. They show up at public meetings and demand all of the conveniences that come with driving. They want it, that is, until it impacts them directly. Then progress must be stopped. Then they all turn into environmentalists. I'd seen it many times. She seemed to fit the profile, especially with her next question.
“So, you are going to remove the trees from the clear zone to improve safety?”
“Yes. Exactly.”
“How big is the clear zone?”
I took a deep breath and looked down. “The clear zone is 25 feet on each side of the street.”
“Twenty-five feet! That is my entire front yard!”
I wasn't going to compromise on safety. I had a code of ethics demanding that I put the welfare of the general public ahead of concerns like this. I had worked years to get my license, and I wasn't about to risk it by not following the design standard.
Plus,
