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.
If you drive in the fog, we caution against speeding while driving in the fog. Even though the speed limit may be 50 mph, that does not mean you should drive at this speed. In fact, speed limits are designed for driving in perfect conditions. When the weather is a factor, youâll need to driver at a slower speed than normal.