2. A section of highway has the following flow-density relationship: q = 50k - 0.156k² Draw the speed-flow, and speed-density curves, and estimate the capacity of the highway section, the speed at capacity, and the density when the highway is at one-quarter of its capacity? 3. Given that the relationship between spacing and speed obtained from actual data is s = 0.3/(60-u) Derive the relationships speed-flow, speed-density, flow-density. Also, estimate the capacity of the roadway.