{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:MYZYH6WFROUBHGYKQV55SGAAO3","short_pith_number":"pith:MYZYH6WF","canonical_record":{"source":{"id":"1812.01788","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.AP","submitted_at":"2018-12-05T02:31:26Z","cross_cats_sorted":[],"title_canon_sha256":"4cdc682ee25d69fbdec113342c602d0a45135b7e907b5b36363e7fa31bfe3516","abstract_canon_sha256":"e20b87f855140ec992a108ef27f55cd64d49fcc8faf167ea8a27f5ef44f907ce"},"schema_version":"1.0"},"canonical_sha256":"663383fac58ba8139b0a857bd9180076e9359995e8bc613f75fdffedd89378ce","source":{"kind":"arxiv","id":"1812.01788","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1812.01788","created_at":"2026-05-17T23:58:08Z"},{"alias_kind":"arxiv_version","alias_value":"1812.01788v2","created_at":"2026-05-17T23:58:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1812.01788","created_at":"2026-05-17T23:58:08Z"},{"alias_kind":"pith_short_12","alias_value":"MYZYH6WFROUB","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_16","alias_value":"MYZYH6WFROUBHGYK","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_8","alias_value":"MYZYH6WF","created_at":"2026-05-18T12:32:40Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:MYZYH6WFROUBHGYKQV55SGAAO3","target":"record","payload":{"canonical_record":{"source":{"id":"1812.01788","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.AP","submitted_at":"2018-12-05T02:31:26Z","cross_cats_sorted":[],"title_canon_sha256":"4cdc682ee25d69fbdec113342c602d0a45135b7e907b5b36363e7fa31bfe3516","abstract_canon_sha256":"e20b87f855140ec992a108ef27f55cd64d49fcc8faf167ea8a27f5ef44f907ce"},"schema_version":"1.0"},"canonical_sha256":"663383fac58ba8139b0a857bd9180076e9359995e8bc613f75fdffedd89378ce","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:58:08.341068Z","signature_b64":"l+NSUwFVKj/hw2s0FrqGqc0OEMELPhgQ31BDIlinESSaQNKNvxWJPq4IYAi6+MVId/5hhUUq0QwhRbvkrpv0Ag==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"663383fac58ba8139b0a857bd9180076e9359995e8bc613f75fdffedd89378ce","last_reissued_at":"2026-05-17T23:58:08.340541Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:58:08.340541Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1812.01788","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:58:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"G9ddF1gq/TDeqghBMXZfv5Mp67aV87h0M0pnFdxJwIZxb2O2onojMRa3FnfEVtx6PCOIThMou8pMasD3CVxLCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-11T06:43:02.768948Z"},"content_sha256":"3dc3c7f9398e08c7b278e6f6cbca9a78a63e6659b3f934f09be3a4249e82e283","schema_version":"1.0","event_id":"sha256:3dc3c7f9398e08c7b278e6f6cbca9a78a63e6659b3f934f09be3a4249e82e283"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:MYZYH6WFROUBHGYKQV55SGAAO3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Effects of Transit Signal Priority on Traffic Safety: Interrupted Time Series Analysis of Portland, Oregon, Implementations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"stat.AP","authors_text":"David Noyce, Yu Song","submitted_at":"2018-12-05T02:31:26Z","abstract_excerpt":"Transit signal priority (TSP) has been implemented to transit systems in many cities of the United States. In evaluating TSP systems, more attention has been given to its operational effects than to its safety effects. Existing studies assessing safety effects of TSP reported mixed results, indicating that the safety effects of TSP vary in different contexts. In this study, TSP implementations in Portland, Oregon, were assessed using interrupted time series analysis (ITSA) on month-to-month changes in number of crashes from January 1995 to December 2010. Single-group and controlled ITSA were c"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1812.01788","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:58:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"603tXAy9p/OIRGcxETAFO3xPby5uQ4qbcIX4aNYhV8dJojNmpgpdeYkSfQUTjUCjYGkgexSBpgnX+yG7MTqzDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-11T06:43:02.769682Z"},"content_sha256":"f6eebd8a0272c82ebe981ad36a611fed4324b812737b1e11b4267fe9e79f37f9","schema_version":"1.0","event_id":"sha256:f6eebd8a0272c82ebe981ad36a611fed4324b812737b1e11b4267fe9e79f37f9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MYZYH6WFROUBHGYKQV55SGAAO3/bundle.json","state_url":"https://pith.science/pith/MYZYH6WFROUBHGYKQV55SGAAO3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MYZYH6WFROUBHGYKQV55SGAAO3/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-11T06:43:02Z","links":{"resolver":"https://pith.science/pith/MYZYH6WFROUBHGYKQV55SGAAO3","bundle":"https://pith.science/pith/MYZYH6WFROUBHGYKQV55SGAAO3/bundle.json","state":"https://pith.science/pith/MYZYH6WFROUBHGYKQV55SGAAO3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MYZYH6WFROUBHGYKQV55SGAAO3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:MYZYH6WFROUBHGYKQV55SGAAO3","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"e20b87f855140ec992a108ef27f55cd64d49fcc8faf167ea8a27f5ef44f907ce","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.AP","submitted_at":"2018-12-05T02:31:26Z","title_canon_sha256":"4cdc682ee25d69fbdec113342c602d0a45135b7e907b5b36363e7fa31bfe3516"},"schema_version":"1.0","source":{"id":"1812.01788","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1812.01788","created_at":"2026-05-17T23:58:08Z"},{"alias_kind":"arxiv_version","alias_value":"1812.01788v2","created_at":"2026-05-17T23:58:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1812.01788","created_at":"2026-05-17T23:58:08Z"},{"alias_kind":"pith_short_12","alias_value":"MYZYH6WFROUB","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_16","alias_value":"MYZYH6WFROUBHGYK","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_8","alias_value":"MYZYH6WF","created_at":"2026-05-18T12:32:40Z"}],"graph_snapshots":[{"event_id":"sha256:f6eebd8a0272c82ebe981ad36a611fed4324b812737b1e11b4267fe9e79f37f9","target":"graph","created_at":"2026-05-17T23:58:08Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"Transit signal priority (TSP) has been implemented to transit systems in many cities of the United States. In evaluating TSP systems, more attention has been given to its operational effects than to its safety effects. Existing studies assessing safety effects of TSP reported mixed results, indicating that the safety effects of TSP vary in different contexts. In this study, TSP implementations in Portland, Oregon, were assessed using interrupted time series analysis (ITSA) on month-to-month changes in number of crashes from January 1995 to December 2010. Single-group and controlled ITSA were c","authors_text":"David Noyce, Yu Song","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.AP","submitted_at":"2018-12-05T02:31:26Z","title":"Effects of Transit Signal Priority on Traffic Safety: Interrupted Time Series Analysis of Portland, Oregon, Implementations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1812.01788","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:3dc3c7f9398e08c7b278e6f6cbca9a78a63e6659b3f934f09be3a4249e82e283","target":"record","created_at":"2026-05-17T23:58:08Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"e20b87f855140ec992a108ef27f55cd64d49fcc8faf167ea8a27f5ef44f907ce","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.AP","submitted_at":"2018-12-05T02:31:26Z","title_canon_sha256":"4cdc682ee25d69fbdec113342c602d0a45135b7e907b5b36363e7fa31bfe3516"},"schema_version":"1.0","source":{"id":"1812.01788","kind":"arxiv","version":2}},"canonical_sha256":"663383fac58ba8139b0a857bd9180076e9359995e8bc613f75fdffedd89378ce","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"663383fac58ba8139b0a857bd9180076e9359995e8bc613f75fdffedd89378ce","first_computed_at":"2026-05-17T23:58:08.340541Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:58:08.340541Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"l+NSUwFVKj/hw2s0FrqGqc0OEMELPhgQ31BDIlinESSaQNKNvxWJPq4IYAi6+MVId/5hhUUq0QwhRbvkrpv0Ag==","signature_status":"signed_v1","signed_at":"2026-05-17T23:58:08.341068Z","signed_message":"canonical_sha256_bytes"},"source_id":"1812.01788","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3dc3c7f9398e08c7b278e6f6cbca9a78a63e6659b3f934f09be3a4249e82e283","sha256:f6eebd8a0272c82ebe981ad36a611fed4324b812737b1e11b4267fe9e79f37f9"],"state_sha256":"965d78aee5d90802ebbb87ad845d89d65aa4bcdcc1f46aeb867fbb1f1a4fb6c9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YvftFMfMXQ6Zhgu2+hLrf/vSjERywCAiJa9X83GrB+8/TRwJMvJ5ZPP0KGh7OxXVJWtTuP+yUQ1dxL+wmvToBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-11T06:43:02.773929Z","bundle_sha256":"c21c0bbfa6e0959d5a9765c48a9c58e3b7147832be08131e27495c79ad6aafc6"}}