Welding by the shadow. by Rob. (NYC). To run nice and straight stringers with 7018. on pipe, I use what's called  welding by the. shadow. The second pass casts a shadow. exactly at the highest part of the first. This. shadow is a perfect straight line!Just run.the puddle edge along the line formed where.NYC). To run nice and straight stringers with 7018. on pipe, I use what's called  welding by the. shadow. The second pass casts a shadow. exactly at the highest part of the first. This. shadow is a perfect straight line! Just run. the puddle edge along the line formed where.
To establish proper visual lead time on a city street, you should be looking at least 15 seconds ahead, which will work out to be at least a block ahead (about 600 feet). On the highway, you should also be looking at least fifteen seconds ahead as well, which works out to be at least one-quarter of a mile ahead.
Thinking, braking and stopping distance. To be a safe driver you need to understand the factors that affect a car's stopping distance. The stopping distance depends on two factors: 1  Thinking distance-It takes time for a driver to react to a situation.2  Braking distance-The braking distance is the distance taken to stop once the brakes are applied.he stopping distance depends on two factors: 1  Thinking distance-It takes time for a driver to react to a situation. 2  During this reaction time the car carries on moving.