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Chapter 7. Transportation. Content…. Drivers of transportation decisions Modes of transportations Devising a strategy for transportation Vehicle scheduling Transportation cost in e-retailing. Key Transportation Decisions. Selection of Transportation Strategy :

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chapter 7

Chapter 7

Transportation

content
Content…..
  • Drivers of transportation decisions
  • Modes of transportations
  • Devising a strategy for transportation
  • Vehicle scheduling
  • Transportation cost in e-retailing
key transportation decisions
Key Transportation Decisions
  • Selection of Transportation Strategy:
    • Transportation strategy would involve designing the most effective way of reaching products to geographically dispersed markets from plants in a cost effective way.
  • Choice of Transportation Mode:
    • Choosing the most effective mode of transport from among several feasible options.
slide4

C1

C2

C3

C4

C5

C6

INBOUND

TRANSPORTATION

INTERFACILITY

TRANSPORTATION

DISTRIBUTION

CENTERS

PLANTS

VENDORS

OUTBOUND

TRANSPORTATION

CUSTOMERS

drivers of transportation decisions
Drivers of Transportation Decisions
  • Transportation cost structure
  • Economies of distance & scale
    • FTL versus LTL
  • Product and demand characteristics
    • Value density
    • Demand characteristics
    • Customer requirements ( Delivery time)
transportation modes
Transportation Modes
  • Transportation modes
    • Air
    • Pipeline
    • Rail
    • Road
    • Water
  • Mix mode services
    • Package carriers
    • Intermodal containers
  • Impact on SCM performance measures
impact of mode of transportation on supply chain performance measures
Impact of Mode of Transportation on Supply Chain Performance Measures
  • Freight cost:
  • Lot size:Differences in required shipment sizes translate to differences in cycle stock related inventory.
  • Delivery time: pipeline inventory and safety stock carried in supply chain is a function of lead-time in transport
  • Delivery time variability: safety stock carried in a supply chain is function of the variability in lead time in transport,
  • Losses and Damages

Total cost = Fright cost + Cycle stock inventory carrying cost +

Pipeline Inventory carrying cost

+ safety stock inventory costs + Cost of losses and damages

slide10

Relative Ranking* of Transportation Mode by Performance Measures

*1 is most favourable & 5 is least favourable from shipper point of views

* * Delivery time variability in absolute terms

choice of mode of transport illustration
Choice of Mode of Transport: Illustration

Product : Printer

High End Standard Low end

Value/unit ( Rs.) 20,000 15,000 10,000

Inv. Carrying cost/unit/year 4,000 3000 2000

Mean Demand/week (units) 100 100 100

SD of demand /week(Units) 30 30 30

Option Sea Air

Lot size (units) 400 100

Fright/unit (Rs.) 90 360

Led time(weeks) 4 1

Target service level: 98%

slide12

Cost Comparisons for Different Modes of Transport Under Stable Demand*

Impact of Value Density

Optimal Decision : For high end :Air. For standard and low end : Sea

* Assumption : SD of demand = 0 ( No demand uncertainty)

slide13

Cost Comparisons in Situation of Demand Uncertainty

Impact of Value density and Demand Uncertainty

Optimal Decision : For high end and standard: Air. For low-end: Sea

design of distribution network
Design of Distribution Network
  • Direct shipment
  • Milk Run from each plant (Aggregate demand across depots)
  • Shipment via Depot
  • Cross Docking
  • Hub- and spoke model
  • Different Strategy for different category of products/customers
hll supply chain

Supplier

Factory

100

Depot

80

Redistribution Stockists

10,000 +

Supplier

Factory

100

Depot

80

Redistribution Stockists

10,000 +

Retailers

1Mn +

Consumer

HLL Supply Chain

HPC Business:

·More than 400 SKUs (110 brands in 950 packs)

restructuring of hll supply chain

DRP

Dispatches against order

Factory

Depot

Redistribution Stockiest (RS)

Daily Resource Planning (DRP)

Continuous Replenishment

High Volume Items

Low Volume Items

Redistribution Center (RDC)

Restructuring of HLL Supply Chain
comparison of distribution network design options illustration
Comparison of Distribution Network Design Options: Illustration
  • Manufacturing firm has three plants (A, B &C), each manufacturing a different product line and serving a stable market through three depots ( X, Y &Z). Plant A is manufacturing menswear, plant B is manufacturing ladies wear and plant C is manufacturing children’s wear.
  • Weekly demand = 100 units for each of the three types of garments at each of the three depots
slide21

Truck can carry 300 units of garments and the transport cost is Rs 2 per km. for TL shipments. To obtain economies of scale firm has decided to work with TL shipments.. Inventory carrying cost is at 20% per annum.

  • All the products cost Rs 200 per unit, so inventory carrying cost is Rs 40 per unit per year. Facility cost of maintaining a DC is Rs 12,000 per year.
slide22

Transportation Strategy:

Linking Plants to Markets

slide23

Comparison of the Three Transportation Strategies

How would network design change if demand at each depot is 300 units per week for each of the product?

vehicle scheduling
Vehicle Scheduling
  • Basic Vehicle scheduling formulation
  • Heuristics
    • Saving Matrix Method
slide25

Typical Vehicle Scheduling Problem

Depot at location 0 serving 10 retailers

saving algorithm
Saving Algorithm
  • Construct distance matrix
  • Calculate savings for all the pairs of customer i and j

Sij = C1i -Cij + Cj1

  • Order savings in descending order
  • Start at the top link, do following:
    • If making a given link results in feasible route( feasibility constraints, can be used to extend one of the existing route or starting a new route), append this link to solution, if not reject the link
    • Repeat above step until no more links are left
saving algorithm1
Saving Algorithm

Depot(1)

Ci1

Cj1

C1i

C1j

Node i

Node j

Savings if routes are merged = Ci1+Cj1-Cij

slide29

Vehicle Scheduling Exercise

Consider an instance of the VRP with the deport at vertex 1 and

six customers at vehicles 2, …., 7. The symmetric distance matrix is shown in table. There are two vehicles with capacities Q1=Q2=6. The customer demands are (q2,….q7) = (2,3,1,1,2,1).

Distance matrix for a VRP

-

slide30

Saving Matrix

Suggested routes based on Saving algorithm:

Route1 : 1-5-2-6-7-1

Route 2 : 1-3-4-1

slide32

Cost Matrix

Distance and load related data

example
Example

Design the vehicle route for a consumer goods company that has 10 dealers. The capacity of the vehicle is 25 units and other relevant data are as follows:

vehicle route planning extensions
Vehicle Route Planning:Extensions
  • Vehicle can operate multiple routes
  • Time window for a customer
  • Business may involve both deliveries and collections
  • Vehicles ( drivers) may have a time window
  • Time consuming activities other than travel:
    • Loading & unloading
    • Queuing at loading and unloading
vehicle routing strategic decisions
Vehicle Routing: Strategic Decisions
  • Fixed versus dynamic routes
  • Temporal consolidation
    • Time based
    • Quantity based
  • Nature of relationship with transport carrier
    • Short term versus long term contract
  • Special vehicle versus standard vehicle
    • Load and volume optimization
e retailing
E-Retailing
  • Provides the convenience of shopping from home
  • E-retailer can provide higher variety compared to Brick and Mortar store and still mange higher inventory turns
    • Centralisation versus decentralisation of inventory
  • Transportation cost is higher for e-retailer
    • Small shipment size
    • Last-mile transportation
slide40

Product/market Characteristic

    • Value density, Nature of demand uncertainty, Volume of demand
  • Cases
    • Dell Computers, Amazon, Webvan
  • Grocery on net : Webvan Versus Tesco
  • Indian Experiences: firstandsecond.com, and Rediff.com, Indiaplaza.com