Over the last few years, I have transitioned to using a bike light even in the daytime, especially when riding in populated areas rife with cross streets and driveways.
The knee-jerk reflex from drivers works to your personal safety—
Drivers pay attention to lights. I have personally observed all of the following using my daytime running light approach:
- A vehicle coming around a curve can be seen to lurch back into its lane.
- A vehicle jerks as the brakes are slammed on, before it was about to enter the roadway and occupy the space you intended to occupy.
- A vehicle delays a right turn, because a bright light can be seen behind and to the right.
- A vehicle is over the center line, but moves back onto its side of the road.
- A drunken or inattentive driver hits the brakes because the light reaches his/her dimly functioning brain.
- A vehicle stops at a stop sign instead of rolling through it.
Read my article Lupine Piko Dual-LED Lamphead for Daytime Safety.