A work assignment had taken my coworker and me on a 250-mile journey, and it was late when we began our trip home. An aging body with aging eyes makes me a bit uneasy about nighttime driving; nevertheless, I opted to drive first. My hands gripped the steering wheel and my eyes gazed intently at dimly lit roads. While driving I found I could see better when lights from vehicles behind me beamed on the highway before me. I was much relieved when my friend eventually took the wheel of his vehicle. That’s when he discovered that I had been…