ET102-WK5-5.2-Part-1-Douglas-Garrett

EET110 Traffic Light Improvement Instructor: Dr. Robert A Frank Campus: Project 5.2 Assignment 5.2 Project Part 1 Student Name(s): Douglas Garret

2 Table of Contents Table of Tables ............................................................................................................................................. 2 Abstract ....................................................................................................................................................... 3 Introduction ................................................................................................................................................. 3 Procedures ................................................................................................................................................... 3 Data Presentation & Analysis ....................................................................................................................... 4 Design Modifications ................................................................................................................................... 6 Program Flow .............................................................................................................................................. 6 Conclusion and Future Work ....................................................................................................................... 9 References ................................................................................................................................................... 9 Honor Pledge: I pledge to support the Honor System of ECPI. I will refrain from any form of academic dishonesty or deception, such as cheating or plagiarism. I am aware that as a member of the academic community, it is my responsibility to turn in all suspected violators of the honor code. I understand that any failure on my part to support the Honor System will be turned over to a Judicial Review Board for determination. I will report to the Judicial Review Board hearing if summoned. Table of Tables Table 1 Timings during normal conditions ................................................................................................... 4 Douglas Garret 05/09/23

4 inclement weather, I have decided to further reduce the deceleration of the vehicles to 9.8ft/sec^2. I also increased the reaction time as visibility during rain and snow can increase the likelihood that a vehicle will not stop in time. This can be seen on the graphs on page 6 image 2, the yellow light interval is increased allowing vehicles more time to clear the intersection and stop during bad weather. The design of the weather-sensing traffic light timer uses a localized weather station to provide the traffic light module with an open circuit during normal weather conditions. When weather conditions change below 32 degrees, or humidity is over 98%, the circuit is closed, and the traffic light module reverts to its inclement weather parameters. These parameters allow for increased yellow light times for fog, rain, snow, and ice. Data Presentation & Analysis In Table 1 below, you will see the different yellow light intervals along with the red clearance interval times during normal weather for each of the 4 sized intersections at 4 different speeds. Using the formula (Y=t+1.74V/2a+64.4g) derived from the Virginia Police Department for calculating yellow light intervals. (VBPD 2023) Using this formula we could calculate the safe yellow light intervals needed during normal weather conditions. We could also plug and play different road grades, intersection widths, reaction times, and deceleration times. Based on other research and common sense, we can change the values to improve the traffic light system. Changing the reaction time and deceleration during inclement weather will increase the yellow light interval giving drivers more time to clear the intersection. You can view this in image 2 on page 6. Table 1 Timings during normal conditions Intersection Posted Speed Limit Adjusted Speed Limit * Grade Width of Intersection PRT Deceleration Vehicle Length Yellow Interval Red Clearance Interval Photo taken after V (mph) V* (mph) g W (ft) t (sec) a (ft/sec 2 ) L (ft) Y (sec) R (sec) TV (sec) 1 30 37 0 90 0.75 11.2 18 3.18 0.99 4.66 35 42 0 90 0.75 11.2 18 3.51 0.75 4.76 45 52 0 90 0.75 11.2 18 4.16 0.41 5.08 50 57 0 90 0.75 11.2 18 4.49 0.29 5.28 2 30 37 0 120 0.75 11.2 18 3.18 1.54 5.22 35 45 0 120 0.75 11.2 18 3.70 1.09 5.29 Douglas Garret 05/09/23

5 45 52 0 120 0.75 11.2 18 4.16 0.81 5.47 50 57 0 120 0.75 11.2 18 4.49 0.65 5.64 3 30 37 0 150 0.75 11.2 18 3.18 2.09 5.77 35 42 0 150 0.75 11.2 18 3.51 1.72 5.73 45 52 0 150 0.75 11.2 18 4.16 1.20 5.86 50 57 0 150 0.75 11.2 18 4.49 1.01 6.00 4 30 37 0 180 0.75 11.2 18 3.18 2.64 6.32 35 42 0 180 0.75 11.2 18 3.51 2.21 6.21 45 52 0 180 0.75 11.2 18 4.16 1.59 6.25 50 57 0 180 0.75 11.2 18 4.49 1.36 6.35 Image 1 Timings during normal conditionsX Douglas Garret 05/09/23

7 // //Variables int NSGreen = 2; //Ataches north/south green variable to pin two int NSYellow = 4; //Ataches north/south yellow variable to pin four int NSRed = 6; //Ataches north/south red variable to pin six int EWGreen = 3; //Ataches east/west green variable to pin three int EWYellow = 5; //Ataches east/west yellow variable to pin five int EWRed = 7; //Ataches east/west red variable to pin seven void setup() { // put your setup code here, to run once: pinMode ( NSGreen, OUTPUT ); //Sets pin mode for north/south green pinMode ( NSYellow, OUTPUT ); //Sets pin mode for north/south yellow pinMode ( NSRed, OUTPUT ); //Sets pin mode for north/south red pinMode ( EWGreen, OUTPUT ); //Sets pin mode for east/west green pinMode ( EWYellow, OUTPUT ); //Sets pin mode for east/west yellow pinMode ( EWRed, OUTPUT ); //Sets pin mode for east/west red //For this circuit setting a pin high turns the LED OFF, and low turns the LED ON digitalWrite ( NSGreen, HIGH ); //Sets default state for north/south green on first pass digitalWrite ( NSYellow, HIGH ); //Sets default state for north/south yellow on first pass digitalWrite ( EWGreen, HIGH ); //Sets default state for east/west green on first pass digitalWrite ( EWYellow, HIGH ); //Sets default state for east/west yellow on first pass } Douglas Garret 05/09/23

8 void loop() { // put your main code here, to run repeatedly: digitalWrite ( NSRed, LOW ); //Turn on north/south red digitalWrite ( EWRed, LOW ); //Turn on east/west red delay ( 3000 ); //Wait 3 seconds or 3000 milli seconds digitalWrite ( NSRed, HIGH ); //Turn off north/south red digitalWrite ( NSGreen, LOW ); //Turn on north/south green delay ( 3000 ); //Wait 3 seconds or 3000 milli seconds digitalWrite ( NSGreen, HIGH ); //Turn off north/south green digitalWrite ( NSYellow, LOW ); //Turn on north/south yellow delay ( 2000 ); //Wait 2 seconds or 2000 milli seconds digitalWrite ( NSYellow, HIGH); //Turn off north/south yellow digitalWrite ( NSRed, LOW ); //Turn on north/south red delay ( 3000 ); //Wait 3 seconds or 3000 milli seconds digitalWrite ( EWRed, HIGH ); //Turn off east/west red digitalWrite ( EWGreen, LOW ); //Turn on east/west green delay ( 3000 ); //Wait 3 seconds or 3000 milli seconds digitalWrite ( EWGreen, HIGH ); //Turn off east/west green digitalWrite ( EWYellow, LOW); //Turn on east/west yellow delay ( 2000 ); //Wait 2 seconds or 2000 milli seconds digitalWrite ( EWYellow, HIGH); //turn off east/west yellow for next pass } Douglas Garret 05/09/23