UTM Autonomous System – Dynamically Changing Quantities – Management Assignment Help

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Assignment Task :

AIMS:  This coursework is based on the Urban Traffic Management (UTM) Case Study introduced in this module, and a Prolog traffic simulator which will be introduced to the student during the module. 

The idea is that the simulation represents the environment of the autonomous system; the sensors of the environment are the results of Prolog code queries which return dynamically changing quantities such as the occupancies of road links. The actions on the environment that the system can take are in changing the stage length (and therefore green time) of traffic signals at any of the scenario’s junctions – stage length might be lengthened or shortened. Students will write strategies in this way which will autonomously control the traffic in order to achieve goals, such as controlling queue lengths. This coursework aims to give the student experience and insights into the workings of a UTM autonomous system.

 

LEARNING OUTCOMES:

This assignment will assess all outcomes 1,3,4. Tutor reassessment will be available for this assignment.

 

PREPARATIONS:

You have access to a Prolog simulator, the specification of dynamics of traffic (a domain model) and urban traffic scenarios (containing initial states and plans), with features similar to those in the UTM case study 2. The Urban Traffic Scenarios are all based on a fictional variation of a road corridor in Hebden Bridge, West Yorkshire area. 

https://www.google.com/maps/@53.7411073,-2.0154676,17z

The simulator inputs the domain model and a scenario, and simulates the flow of traffic through the scenario within a specified number of seconds, with a specified time step (usually 1 second). The topology of the scenarios is depicted in the diagram at the end of this document. Each of the scenario files is a database in Prolog syntax containing objects, static facts (e.g. capacity of links), dynamic facts (e.g. occupancy of links), a current traffic plan (the length of signal stages in each junction in the scenario), a list of times of “pressing” events over the period (pushing of the request button on a pelican crossing). Dynamic facts are updated each time step by the Prolog simulator, as traffic flows through the network, as specified by the flow rates in the scenario. 

To prepare for the exercises below, examine the code in the simulator – in particular, the code which executes the current traffic plan. Run the Prolog simulator with the scenarios given out and note the results after each run. 

COURSEWORK QUESTIONS:

You are required to do the following. The first question Q1 is a “theoretical one”, Q2 and Q3 are “practical”, and Q4 covers the evaluation.

1. Consider the initial stage lengths in scenario1.pl for junction centre; perform the following exercises by hand, showing your workings:

(a). Draw a Split Cycle diagram of the junction called centre (such as the diagram shown in exercise 2 of Tutorial 7), and calculate the cycle length of centre.

(b). at the start of scenario1.pl, what is the average flow coming out of link market_east which flows through junction centre? (NB consult tutorial exercises of UNIT 7 and UNIT 9).

(c). given the maximum / minimum stage times of centre in scenario1.pl, what is the maximum average flow per cycle out of the link? What is the minimum average flow per cycle out of link?  (NB consult tutorial exercises of UNIT 7 and UNIT 9).

 

 

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