dssad data storage capacity - scenario assumption
TRANSCRIPT
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DSSAD Data Storage Capacity - Scenario Assumption:
◆ ALKS with the maximum operational speed of 60km/h
◆ Weekdays, Depart at 9:00 morning and Return at 18:00 evening
◆ Traffic Jam Definition:
✓ According to the VICS* definition (RED (Traffic Jam) = 40km/h and below on highway, 20km/h and below on urban expressway; ORANGE (Heavy Traffic) = 40 to 60 km/h on highway, 20 to 40 km/h on urban expressway)
✓ However, most of the metropolitan expressways have speed limit of 60km/h and therefore consider as: no color =no traffic jam, the areas in between ORANGE =traffic jam
◆ ALKS Operation Conditions
✓ Not activated in the areas requires frequent ON & OFF (e.g. short distance between the junctions)
✓ For the areas below 60km/h speed limit, the system continues the operation until system is cancelled by the override (by the driver’s acceleration, etc.)
◆ “Driver Not Available” status is detected once a day
*VICS : Vehicle Information & Communication Service
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Driving Routes:
Area Distance Route
Wako – Aoyama 25km Metro Expressway
Fuchu - Aoyama 29km Chuo Expressway/Metro Expressway
Chiba - Suidobachi 42kmHigashikanto Expressway/Metro
Expressway
Aoba - Suidobachi 34kmTokyo-Nagoya Expressway/Metro
Expressway
Machida - Yokohama 25km Yokohama By-Pass
Shinagawa - Yokohama 28km Metro Expressway Kanagawa
➢ 1-hour driving routes (in normal traffic conditions) in the metropolitan area (Tokyo, Chiba, Saitama, Kanagawa)
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Wako –Aoyama
Outbound:
• SYSTEM ON after passing the Junction
• TD due to the driver condition
• SYSTEM OFF by driver input
• Driver resumes SYSTEM ON
• After the traffic jam ends SYSTEM OFF by driver override
ON
北池袋
外苑
Metro Expressway
Evening - outboundMorning - inbound
三宅坂JCT
中台
Metro Expressway
SYSTEM ON
TD
Driver notAvailable
Override SYSTEMON
Override
SYSTEMOFF
SYSTEMOFF
SYSTEMON
Override
SYSTEMOFF
Override+OFF
Override+OFF
Not Available+TD
11
Override+OFF
ON
竹橋JCT
Inbound:
• SYSTEM ON after merge onto Metropolitan Expressway
• After the traffic jam ends SYSTEM OFF by driver overrideON
Number of Timestamps
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Fuchu - Aoyama
Chuo Expressway
Metro Expressway
Chuo Expressway
Metro Expressway
Inbound:
• SYSTEM ON at the congested area
• TD – driver input – SYSTEM OFF at the toll
• Driver turns ON the system again
• After the traffic jam ends SYSTEM OFF by driver override
Outbound:
• SYSTEM ON at the congested area
• TD due to the driver not available
• Driver resumes SYSTEM ON
• After the traffic jam ends SYSTEM OFF by driver override
Morning - inbound
Evening - outbound
Toll
外苑
外苑
SYSTEMON
TD
Driver notAvailable
TD Override SYSTEMON
Override
SYSTEMOFF
SYSTEMOFF
SYSTEMON
Override
SYSTEMOFF
ON
ON
Not Available+TD
Override+OFF
ON
TD⇒Override+OFF
Override+OFF
Override+OFF
ON
Toll
SYSTEMON
Override
SYSTEMOFF
15
Number of Timestamps
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SYSTEMON Override
SYSTEMOFF
SYSTEMON
TD
Driver notAvailable
Override
SYSTEMOFF
SYSTEMONTD Override
SYSTEMOFF
Chiba - Suidobashi
Evening - outbound
湾岸習志野
Morning - inbound
湾岸市川
西神田
湾岸習志野
辰巳JCT
京葉道路接続 京葉道路接続
Outbound:
• Not so much congestion, so system is not activated
東関東自動車道
ON
Override+OFF
Not Available+TD
ON
TD⇒Override+OFF
首都高
首都高
東関東自動車道
12
Override+OFF
ON
Inbound:
• SYSTEM ON at the congested area
• TD – driver input – SYSTEM OFF at the toll
• Driver turns ON the system again
• TD due to the driver not available
• Driver resumes SYSTEM ON
• After the traffic jam ends SYSTEM OFF by driver override Number of Timestamps
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Aoba to Suidobashi
SYSTEMON
Override
SYSTEMOFF
TD
Driver notAvailable
SYSTEMON
Override
SYSTEMOFF
SYSTEMON
TD Override
SYSTEMOFF
15
Inbound:
• SYSTEM ON at the congested area
• TD due to the driver not available
• SYSTEM OFF by the driver input
• Driver resumes SYSTEM ON
• TD right before the toll
• Driver input – OFF – Driver resume SYSTEM ON
• After the traffic jam ends SYSTEM OFF by driver override
Outbound:
• SYSTEM ON at the congested area
• After the traffic jam ends SYSTEM OFF by driver override
SYSTEMON
Override
SYSTEMOFF
Number of Timestamps
Evening - outboundMorning - inbound
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Machida - Yokohama
三ツ沢
ON
TD⇒Override+OFF
三ツ沢ON
TD⇒Override+OFF
Not Available+TD
ON横浜新道 横浜新道
Override+OFF
Inbound:
• SYSTEM ON at the Hodogaya Bypass
• After the traffic jam ends TD – Driver override, SYSTEM OFF
Outbound:
• SYSTEM ON at the congested area
• TD due to the driver not available
• SYSTEM OFF by the driver input
• Driver resumes SYSTEM ON
• At the exit area TD – driver override, SYSTEM OFF
13SYSTEM
ON
TD
Driver notAvailable
Override SYSTEMON
Override
SYSTEMOFF
SYSTEMOFF
SYSTEMON Override
SYSTEMOFF
TDTD
HodogayaBypass
HodogayaBypass
Number of Timestamps
Evening - outboundMorning - inbound
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Shinagawa - Yokohama
Not Available+TD
ON
首都高速神奈川首都高速神奈川
勝島
横浜公園
ON
TD⇒Override+OFF
首都高速だが、該当区間は制限速度80k/h区間
Override+OFF
9
TD
Driver notAvailable
SYSTEMON
Override
SYSTEMOFF
SYSTEMON Override
SYSTEMOFF
TD
Outbound:
• SYSTEM ON at the congested area
• SYSTEM ON at the congested area
• TD due to the driver not available
• SYSTEM OFF by the driver input
• Driver resumes SYSTEM ON
• After the traffic jam ends TD –Driver override, SYSTEM OFF
Inbound:
• Not so much congestion, so system is not activated
Number of Timestamps
Evening - outboundMorning - inbound
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Summary: Number of Timestamps
区分 Number of Timestamps(per day)
Wako - Aoyama 11
Fuchu - Aoyama 15
Chiba - Suidobachi 12
Aoba - Suidobashi 15
Machida - Yokohama 13
Shinagawa - Yokohama 9
Avg. 12.5
※Above is when ‘TD’ and ‘Driver not Available’ recorded separately; if one timestamp is used avg. number will be 11.5.
Wako
ChibaShinagawa
Machida
Fuchu
Aoba
◆Number of recorded Timestamps: avg. about 13 per day
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Consideration of Required Storage Capacity (Number of Timestamps)
◆Recoded number of timestamps: avg. 13 per day
◆Assume everyday use for 6 months: 13 times x 30 days x 6 months = 2340 timestamps◆ If assumes more frequent timestamps, 20 times/day, weekday use (5days a week):
20 times x 20 days x 6 months = 2400 timestamps
◆Required Storage Capacity: for assuring 6 months recording, approximately 2500 timestamps need to be stored.