Abstract
As viewed by a driver at a stop sign wishing to cross a one-way traffic stream, time progresses as a series of blocks, i.e. intervals when he cannot move out to cross, and gaps, i.e. non-blocking intervals. Distributions of blocks and gaps are found by elementary techniques under the single assumption that successive headways are uncorrelated. The distribution of delay to the driver waiting to cross is found, and as a special case an important generalization of Tanner's distribution is developed. The "Highway transparency" is derived by an alternative method to that given by other authors. A discussion is given of the limitations of the model for analysis of situations in practice.