$13-4.$ Figure $13\mathrm{.}20$ illustrates two consecutive ramps on an older freeway. It may be assumed that there is a ramp$-$to$-$ramp flow of $200$ veh$/$h$.($a$)$ What is the expected level of service for the conditions shown?$($b$)$ Several improvement plans are under consid eration:i$.$ Connect the two ramps with a continuous auxiliary lane.ii$.$ Add a third lane to the freeway and ex tend the length of acceleration and decel eration lanes to $300$ ft$.$iii. Provide a lane addition at the on$-$ramp that continues past the off$-$ramp on the down stream freeway section. The off$-$ramp de celeration lane remains $200$ ft long.Which of these three improvements would you recommend? Why? Justify your answer.