Pigdon Street traffic conclusions

The traffic surveys conducted on Pigdon Street on Thursday 21st of August and Saturday the 23rd of August 2014 identified a number of distinct traffic patterns. The surveys were conducted along a 200m section of Pigdon Street, with Arnold Street and Garton Street intersections running north-south through the observation area.

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The overall traffic flow along this stretch of Pigdon Street is fairly heavy and dominated by car traffic, with bicycle traffic and pedestrian traffic being significantly lower in comparison.

The above images show a summary of the traffic surveys conducted across the two days, with a 4 hour observation period recorded on Thursday and a 2 hour period on Saturday. The observations indicated that traffic patterns experience a significant shift between daily weekday and weekend usage.

The following analysis details a snapshot of this shift.

Car usage

  • Cars are the predominant users of the street, representing 1807 out of 2472 journeys during the week (73%) and 710 out of 911 during the weekend (78%). The increase in 5% of weekend traffic share comes from the observed decrease in bicycle traffic in comparison with weekday traffic.
  • The majority of car journeys are made during the morning peak hour, 546 out of 1807 car journeys (30%), and the evening peak hour, 628 out of 1807 (35%). Car traffic during the day is significantly less, only 286 out of 1807 journeys, which is around half of either the morning or evening peak periods.
  • Car traffic is concentrated along Pigdon Street, 1656 out of 1807 journeys (67%). The remainder of car traffic during a weekday is along Arnold Street, mainly involving school drop offs in the morning, and Garton Street in the afternoon with people coming home from work. The proportion of traffic along Pigdon Street remains high on the weekend with 674 of all 911 car journeys (74%).
  • There is a shift in the number of cars observed along Pigdon Street during the day with a rise in 32% from 286 during the week to 378 on the weekend. Garton and Arnold Streets have very low volume on the weekend, with only 22 and 14 journeys respectively.

Pedestrian usage

  • Pedestrians represent the smallest share of all traffic through the observation area. During the Thursday observation sessions only 327 of 2472 journeys (13%) were made by pedestrians. 151 (46%) of these were along Pigdon Street.
  • The largest proportion of all pedestrian traffic comes from the morning peak hour where school kids walk along Arnold Street heading north to Princess Hill Primary School and south to Princess Hill Secondary College, representing 18% of all daily pedestrian traffic.
  • Pedestrian traffic shifts during the weekend with the absence of school kids. It also represents the second highest traffic share, with 134 of all 911 journeys (15%), a slight increase of the 13% observed during the week.
  • The shift in traffic patterns comes from the increased number of pedestrians along Pigdon Street, with 95 out of 134 pedestrian journeys (71%). This is a substantial shift from the 46% observed during the week and is largely due to the Princess Park to the west of the observation area, which attracts a large number of local residents, particularly mothers and joggers.

 

Bicycle usage

  • The site is very well used by bicycles, particularly during the week with 333 of 2472 journeys (13.4%). Bicycle journeys are predominantly made during the morning peak hour period, 136 of 333 bicycle journeys (41%). A large proportion of all bicycle journeys is made along the north south bicycle corridors of Garton and Arnold Streets, with 213 of 333 journeys (64%).
  • Bicycle journeys during the weekend decrease by almost 50%. Only 67 of 911 journeys equates to 7.3% of all traffic, or half of the 13.4% observed during the week.
  • Another significant shift between weekday and weekend usage comes from the substantial shift in bike usage along the north-south corridors of Garton and Arnold Streets, with only 31 of all 67 journeys (46%) in comparison to the 64% observed during the week.

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The other distinct traffic pattern and a feature of Pigdon Street is the amount of through traffic in proportion to those that originate within the area.

During the week

  • 98.7% of all car journeys observed were transit, with only 24 out of 1807 journeys being arrivals or departures. Of the 1783 transit journeys, 1592 (89%) travelled along Pigdon Street.
  • 96.6% of all pedestrian journeys observed were transit, with only 11 out of 327 journeys being arrivals or departures. Of the 316 transit journeys, 151 journeys (48%) were made along Pigdon Street.
  • 100% of all bicycle journeys observed were transit, with no journeys observed to arrive to or depart from the site. Of the 333 transit journeys, 211 journeys (63%) were made along Pigdon Street.

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During the weekend

  • 95.4% of all car journeys observed were transit, with only 33 out of 710 journeys being arrivals or departures. Of the 677 transit journeys, 641 journeys (94.6%) were made along Pigdon Street.
  • 89.7% of all pedestrian journeys observed were transit, with only 14 out of 134 journeys being arrivals or departures. Of the 120 transit journeys, 95 journeys (79%) were made along Pigdon Street.
  • 100% of all bicycle journeys observed were transit, with no journeys observed to arrive to or depart from the site. Of the 67 transit journeys, 36 journeys (53.7%) were made along Pigdon Street.

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Another distinct feature of this site was the frequency of journeys made and the amount of time cars and pedestrians spent within the site.

During the week

  • Cars travelled along Pigdon Street at an average speed of 37km/h, with a car journey observed every 11s during the 4 hour observation period. Cars spent 109 minutes every hour driving along Pigdon Street, with 20s taken by each car to travel through the observation area.
  • Cars travelled along Arnold Street and Garton Street at an average speed of 30km/h, with a car journey observed every 102s. Cars spent 7 minutes every hour driving along these streets, with 12s taken by each car to travel through the observation area.
  • Pedestrians travelled along Pigdon Street at an average speed of 5km/h, with a pedestrian journey observed every 125s. Pedestrians spent 65 minutes every hour walking along Pigdon Street, with 136s taken by each pedestrian to travel through the observation area.
  • Pedestrians travelled along Arnold Street and Garton Street at an average speed of 6km/h, with a pedestrian journey observed ever 168s. Pedestrians spent 21 minutes every hour walking along these streets, with 60s taken by each pedestrian to travel through the observation area.
  • Bicycles travelled along Pigdon Street at an average speed of 19km/h, with a bicycle journey observed every 181s. Bicycles spent 12 minutes every hour riding along Pigdon Street, with 37s taken by each cyclist to travel through the observation area.
  • Bicycles travelled along Arnold Street and Garton Street at an average speed of 19km/h, with a bicycle journey observed every 161s. Bicycles spent 9 minutes every hour riding along these streets, with 24s taken by each cyclist to travel through the observation area.

During the weekend

  • Cars travelled along Pigdon Street at an average speed of 35km/h, with a car journey observed every 11s during the 2hr observation period. Cars spent 115 minutes every hour driving along Pigdon Street, with 21s taken by each car to travel through the observation area.
  • Cars travelled along Arnold Street and Garton Street at an average speed of 30km/h, with a car journey observed every 200s. Cars spent 4 minutes every hour driving along these streets, with 12s taken by each car to travel through the observation area.
  • Pedestrians travelled along Pigdon Street at an average speed of 5km/h, with a pedestrian journey observed every 79s. Pedestrians spent 109 minutes every hour walking along Pigdon Street, with 144s taken by each pedestrian to travel through the observation area.
  • Pedestrians travelled along Arnold Street and Garton Street at an average speed of 4km/h, with a pedestrian journey observed every 289s. Pedestrians spent 19 minutes every hour walking along these streets, with 90s taken by each pedestrian to travel through the observation area.
  • Bicycles travelled along Pigdon Street at an average speed of 18km/h, with a bicycle journey observed every 203s. Bicycles spent 12 minutes every hour riding along Pigdon Street, with 40s taken by each cyclist to travel through the observation area.
  • Bicycles travelled along Arnold Street and Garton Street at an average speed of 14km/h, with a bicycle journey observed every 233s. Bicycles spent 7 minutes every hour riding along these streets, with 26s taken by each cyclist to travel along the observation area.

The difference between peak and off peak traffic during the day also gives an interesting insight into the way Pigdon Street is used. All modes of traffic experiences a significant shift between morning and evening peak hours.

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The frequency of car journeys along Pigdon Street during peak hours is double that during other parts of the day, with a car journey observed every 7s during peak hours and every 14s during the day.

The frequency of pedestrian and cyclist journeys decreases significantly from peak hours to during the day, with a pedestrian journey observed every 60s during peak hours and 200s during the day, and bicycle journeys every 78s during peak hour and 327s during the day.

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The frequency of car journeys along Garton Street and Arnold Street during peak hours is nearly two and a half times that during the day, with a car journey observed 68s during peak hours and every 164s during the day.

Again, the frequency of pedestrian and cyclist journeys decreases significantly from peak hours to during the day, with a pedestrian journey observed every 38s during peak hours and 240s during the day, and bicycle journeys every 40s during peak hours and 360s during the day.

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An interesting shift in traffic frequency happens during the weekend, with car journeys along Pigdon Street observed every 10s during the day and 12s during the night. This indicates a fairly constant flow of traffic.

The 63s frequency of pedestrian traffic during the weekend day is also interesting, as it is very close to that of weekday peak hours, indicating that Pigdon Street sees a significant rise in pedestrian traffic during the weekend. It is likely this is due to people visiting adjacent parks.

A greater frequency during the weekend can be seen in bicycle traffic, with a bicycle journey taking place every 180s, nearly double the 327s weekday frequency of cyclists.

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The most significant change in traffic and usage of the site happens during the weekend along Garton Street and Arnold Street, with night-time frequency of cars and cyclists being almost three times less than that observed during weekday nights. With car journeys taking place every 200s during the night on Saturday as opposed to every 75s on Thursday, and bicycle journeys going down from every 84s to 240s, we see that these streets experience a significant decrease in traffic on the weekends.

Conclusions

The above detailed traffic analysis of Pigdon Street and the site have allowed me to reach the following conclusions about the nature of traffic use of the street.

  • Traffic flow along Pigdon Street is heavy for a residential street, and dominated by car journeys.
  • Car traffic along Pigdon Street is constant across the day, with only about a 50% drop in patronage between peak and off-peak periods. This indicates that the street is used as a thoroughfare and a regular used east-west link by motorists.
  • On average, 73% of car traffic is concentrated along Pigdon Street, with intersecting streets, Arnold and Garton, only experiencing heavier traffic during weekday morning peak hours. They remain fairly quiet on weekends.
  • Bicycle usage is significantly higher during weekday peak hour periods, with Garton and Arnold Streets predominantly used by cyclists (students and young professionals) during the week. There is little patronage during the weekend. Bike usage drops by 50% during the weekend, with Pigdon Street becoming the major bicycle corridor instead of Garton and Arnold.
  • Pedestrians represent the smallest share of traffic, with only 13% of all patronage during the week and a small increase to 15% on weekends.
  • Pedestrian traffic along Pigdon Street is significantly less than that along Garton and Arnold Streets. Arnold Street experiences a high number of pedestrian traffic during school drop off and pick up hours.
  • Pedestrians predominantly use Pigdon Street on the weekends as they travel to and from Princes Park to the west. This is also when the highest number of joggers, dog owners and mothers with prams use the street. On the weekend, pedestrians spend over a 100 minutes in the street each hour, at an average frequency of 79s.
  • Cars on average spend over a 100 minutes along Pigdon Street every hour, compared to 12 minutes spent by cyclists and 65 minutes by pedestrians, which again indicates they are the dominant road users during any given time.
  • A very small percentage of all journeys start or finish within the site, indicating that the major users of Pigdon Street are transient and not the residents of the site area.

You can download a detailed .pdf version of this traffic analysis here (10Mb).


Image sources

  1. Thursday summary, this and subsequent images copyright of author.
  2. Saturday summary.
  3. Thursday transit journeys.
  4. Thursday E-W transit journeys.
  5. Saturday transit journeys.
  6. Saturday E-W transit journeys.
  7. Frequency and time taken.
  8. Time spent.
  9. Thursday E-W frequency and time taken.
  10. Thursday E-W time.
  11. Thursday N-S frequency and time taken.
  12. Thursday N-S time.
  13. Saturday E-W frequency and time taken.
  14. Saturday E-W time.
  15. Saturday N-S frequency and time taken.
  16. Saturday N-S time.
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